//! moment.js
//! version : 2.29.4
//! authors : Tim Wood, Iskren Chernev, Moment.js contributors
//! license : MIT
//! momentjs.com

;(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  global.moment = factory()
}(this, (function () { 'use strict';

  var hookCallback;

  function hooks() {
      return hookCallback.apply(null, arguments);
  }

  // This is done to register the method called with moment()
  // without creating circular dependencies.
  function setHookCallback(callback) {
      hookCallback = callback;
  }

  function isArray(input) {
      return (
          input instanceof Array ||
          Object.prototype.toString.call(input) === '[object Array]'
      );
  }

  function isObject(input) {
      // IE8 will treat undefined and null as object if it wasn't for
      // input != null
      return (
          input != null &&
          Object.prototype.toString.call(input) === '[object Object]'
      );
  }

  function hasOwnProp(a, b) {
      return Object.prototype.hasOwnProperty.call(a, b);
  }

  function isObjectEmpty(obj) {
      if (Object.getOwnPropertyNames) {
          return Object.getOwnPropertyNames(obj).length === 0;
      } else {
          var k;
          for (k in obj) {
              if (hasOwnProp(obj, k)) {
                  return false;
              }
          }
          return true;
      }
  }

  function isUndefined(input) {
      return input === void 0;
  }

  function isNumber(input) {
      return (
          typeof input === 'number' ||
          Object.prototype.toString.call(input) === '[object Number]'
      );
  }

  function isDate(input) {
      return (
          input instanceof Date ||
          Object.prototype.toString.call(input) === '[object Date]'
      );
  }

  function map(arr, fn) {
      var res = [],
          i,
          arrLen = arr.length;
      for (i = 0; i < arrLen; ++i) {
          res.push(fn(arr[i], i));
      }
      return res;
  }

  function extend(a, b) {
      for (var i in b) {
          if (hasOwnProp(b, i)) {
              a[i] = b[i];
          }
      }

      if (hasOwnProp(b, 'toString')) {
          a.toString = b.toString;
      }

      if (hasOwnProp(b, 'valueOf')) {
          a.valueOf = b.valueOf;
      }

      return a;
  }

  function createUTC(input, format, locale, strict) {
      return createLocalOrUTC(input, format, locale, strict, true).utc();
  }

  function defaultParsingFlags() {
      // We need to deep clone this object.
      return {
          empty: false,
          unusedTokens: [],
          unusedInput: [],
          overflow: -2,
          charsLeftOver: 0,
          nullInput: false,
          invalidEra: null,
          invalidMonth: null,
          invalidFormat: false,
          userInvalidated: false,
          iso: false,
          parsedDateParts: [],
          era: null,
          meridiem: null,
          rfc2822: false,
          weekdayMismatch: false,
      };
  }

  function getParsingFlags(m) {
      if (m._pf == null) {
          m._pf = defaultParsingFlags();
      }
      return m._pf;
  }

  var some;
  if (Array.prototype.some) {
      some = Array.prototype.some;
  } else {
      some = function (fun) {
          var t = Object(this),
              len = t.length >>> 0,
              i;

          for (i = 0; i < len; i++) {
              if (i in t && fun.call(this, t[i], i, t)) {
                  return true;
              }
          }

          return false;
      };
  }

  function isValid(m) {
      if (m._isValid == null) {
          var flags = getParsingFlags(m),
              parsedParts = some.call(flags.parsedDateParts, function (i) {
                  return i != null;
              }),
              isNowValid =
                  !isNaN(m._d.getTime()) &&
                  flags.overflow < 0 &&
                  !flags.empty &&
                  !flags.invalidEra &&
                  !flags.invalidMonth &&
                  !flags.invalidWeekday &&
                  !flags.weekdayMismatch &&
                  !flags.nullInput &&
                  !flags.invalidFormat &&
                  !flags.userInvalidated &&
                  (!flags.meridiem || (flags.meridiem && parsedParts));

          if (m._strict) {
              isNowValid =
                  isNowValid &&
                  flags.charsLeftOver === 0 &&
                  flags.unusedTokens.length === 0 &&
                  flags.bigHour === undefined;
          }

          if (Object.isFrozen == null || !Object.isFrozen(m)) {
              m._isValid = isNowValid;
          } else {
              return isNowValid;
          }
      }
      return m._isValid;
  }

  function createInvalid(flags) {
      var m = createUTC(NaN);
      if (flags != null) {
          extend(getParsingFlags(m), flags);
      } else {
          getParsingFlags(m).userInvalidated = true;
      }

      return m;
  }

  // Plugins that add properties should also add the key here (null value),
  // so we can properly clone ourselves.
  var momentProperties = (hooks.momentProperties = []),
      updateInProgress = false;

  function copyConfig(to, from) {
      var i,
          prop,
          val,
          momentPropertiesLen = momentProperties.length;

      if (!isUndefined(from._isAMomentObject)) {
          to._isAMomentObject = from._isAMomentObject;
      }
      if (!isUndefined(from._i)) {
          to._i = from._i;
      }
      if (!isUndefined(from._f)) {
          to._f = from._f;
      }
      if (!isUndefined(from._l)) {
          to._l = from._l;
      }
      if (!isUndefined(from._strict)) {
          to._strict = from._strict;
      }
      if (!isUndefined(from._tzm)) {
          to._tzm = from._tzm;
      }
      if (!isUndefined(from._isUTC)) {
          to._isUTC = from._isUTC;
      }
      if (!isUndefined(from._offset)) {
          to._offset = from._offset;
      }
      if (!isUndefined(from._pf)) {
          to._pf = getParsingFlags(from);
      }
      if (!isUndefined(from._locale)) {
          to._locale = from._locale;
      }

      if (momentPropertiesLen > 0) {
          for (i = 0; i < momentPropertiesLen; i++) {
              prop = momentProperties[i];
              val = from[prop];
              if (!isUndefined(val)) {
                  to[prop] = val;
              }
          }
      }

      return to;
  }

  // Moment prototype object
  function Moment(config) {
      copyConfig(this, config);
      this._d = new Date(config._d != null ? config._d.getTime() : NaN);
      if (!this.isValid()) {
          this._d = new Date(NaN);
      }
      // Prevent infinite loop in case updateOffset creates new moment
      // objects.
      if (updateInProgress === false) {
          updateInProgress = true;
          hooks.updateOffset(this);
          updateInProgress = false;
      }
  }

  function isMoment(obj) {
      return (
          obj instanceof Moment || (obj != null && obj._isAMomentObject != null)
      );
  }

  function warn(msg) {
      if (
          hooks.suppressDeprecationWarnings === false &&
          typeof console !== 'undefined' &&
          console.warn
      ) {
          console.warn('Deprecation warning: ' + msg);
      }
  }

  function deprecate(msg, fn) {
      var firstTime = true;

      return extend(function () {
          if (hooks.deprecationHandler != null) {
              hooks.deprecationHandler(null, msg);
          }
          if (firstTime) {
              var args = [],
                  arg,
                  i,
                  key,
                  argLen = arguments.length;
              for (i = 0; i < argLen; i++) {
                  arg = '';
                  if (typeof arguments[i] === 'object') {
                      arg += '\n[' + i + '] ';
                      for (key in arguments[0]) {
                          if (hasOwnProp(arguments[0], key)) {
                              arg += key + ': ' + arguments[0][key] + ', ';
                          }
                      }
                      arg = arg.slice(0, -2); // Remove trailing comma and space
                  } else {
                      arg = arguments[i];
                  }
                  args.push(arg);
              }
              warn(
                  msg +
                      '\nArguments: ' +
                      Array.prototype.slice.call(args).join('') +
                      '\n' +
                      new Error().stack
              );
              firstTime = false;
          }
          return fn.apply(this, arguments);
      }, fn);
  }

  var deprecations = {};

  function deprecateSimple(name, msg) {
      if (hooks.deprecationHandler != null) {
          hooks.deprecationHandler(name, msg);
      }
      if (!deprecations[name]) {
          warn(msg);
          deprecations[name] = true;
      }
  }

  hooks.suppressDeprecationWarnings = false;
  hooks.deprecationHandler = null;

  function isFunction(input) {
      return (
          (typeof Function !== 'undefined' && input instanceof Function) ||
          Object.prototype.toString.call(input) === '[object Function]'
      );
  }

  function set(config) {
      var prop, i;
      for (i in config) {
          if (hasOwnProp(config, i)) {
              prop = config[i];
              if (isFunction(prop)) {
                  this[i] = prop;
              } else {
                  this['_' + i] = prop;
              }
          }
      }
      this._config = config;
      // Lenient ordinal parsing accepts just a number in addition to
      // number + (possibly) stuff coming from _dayOfMonthOrdinalParse.
      // TODO: Remove "ordinalParse" fallback in next major release.
      this._dayOfMonthOrdinalParseLenient = new RegExp(
          (this._dayOfMonthOrdinalParse.source || this._ordinalParse.source) +
              '|' +
              /\d{1,2}/.source
      );
  }

  function mergeConfigs(parentConfig, childConfig) {
      var res = extend({}, parentConfig),
          prop;
      for (prop in childConfig) {
          if (hasOwnProp(childConfig, prop)) {
              if (isObject(parentConfig[prop]) && isObject(childConfig[prop])) {
                  res[prop] = {};
                  extend(res[prop], parentConfig[prop]);
                  extend(res[prop], childConfig[prop]);
              } else if (childConfig[prop] != null) {
                  res[prop] = childConfig[prop];
              } else {
                  delete res[prop];
              }
          }
      }
      for (prop in parentConfig) {
          if (
              hasOwnProp(parentConfig, prop) &&
              !hasOwnProp(childConfig, prop) &&
              isObject(parentConfig[prop])
          ) {
              // make sure changes to properties don't modify parent config
              res[prop] = extend({}, res[prop]);
          }
      }
      return res;
  }

  function Locale(config) {
      if (config != null) {
          this.set(config);
      }
  }

  var keys;

  if (Object.keys) {
      keys = Object.keys;
  } else {
      keys = function (obj) {
          var i,
              res = [];
          for (i in obj) {
              if (hasOwnProp(obj, i)) {
                  res.push(i);
              }
          }
          return res;
      };
  }

  var defaultCalendar = {
      sameDay: '[Today at] LT',
      nextDay: '[Tomorrow at] LT',
      nextWeek: 'dddd [at] LT',
      lastDay: '[Yesterday at] LT',
      lastWeek: '[Last] dddd [at] LT',
      sameElse: 'L',
  };

  function calendar(key, mom, now) {
      var output = this._calendar[key] || this._calendar['sameElse'];
      return isFunction(output) ? output.call(mom, now) : output;
  }

  function zeroFill(number, targetLength, forceSign) {
      var absNumber = '' + Math.abs(number),
          zerosToFill = targetLength - absNumber.length,
          sign = number >= 0;
      return (
          (sign ? (forceSign ? '+' : '') : '-') +
          Math.pow(10, Math.max(0, zerosToFill)).toString().substr(1) +
          absNumber
      );
  }

  var formattingTokens =
          /(\[[^\[]*\])|(\\)?([Hh]mm(ss)?|Mo|MM?M?M?|Do|DDDo|DD?D?D?|ddd?d?|do?|w[o|w]?|W[o|W]?|Qo?|N{1,5}|YYYYYY|YYYYY|YYYY|YY|y{2,4}|yo?|gg(ggg?)?|GG(GGG?)?|e|E|a|A|hh?|HH?|kk?|mm?|ss?|S{1,9}|x|X|zz?|ZZ?|.)/g,
      localFormattingTokens = /(\[[^\[]*\])|(\\)?(LTS|LT|LL?L?L?|l{1,4})/g,
      formatFunctions = {},
      formatTokenFunctions = {};

  // token:    'M'
  // padded:   ['MM', 2]
  // ordinal:  'Mo'
  // callback: function () { this.month() + 1 }
  function addFormatToken(token, padded, ordinal, callback) {
      var func = callback;
      if (typeof callback === 'string') {
          func = function () {
              return this[callback]();
          };
      }
      if (token) {
          formatTokenFunctions[token] = func;
      }
      if (padded) {
          formatTokenFunctions[padded[0]] = function () {
              return zeroFill(func.apply(this, arguments), padded[1], padded[2]);
          };
      }
      if (ordinal) {
          formatTokenFunctions[ordinal] = function () {
              return this.localeData().ordinal(
                  func.apply(this, arguments),
                  token
              );
          };
      }
  }

  function removeFormattingTokens(input) {
      if (input.match(/\[[\s\S]/)) {
          return input.replace(/^\[|\]$/g, '');
      }
      return input.replace(/\\/g, '');
  }

  function makeFormatFunction(format) {
      var array = format.match(formattingTokens),
          i,
          length;

      for (i = 0, length = array.length; i < length; i++) {
          if (formatTokenFunctions[array[i]]) {
              array[i] = formatTokenFunctions[array[i]];
          } else {
              array[i] = removeFormattingTokens(array[i]);
          }
      }

      return function (mom) {
          var output = '',
              i;
          for (i = 0; i < length; i++) {
              output += isFunction(array[i])
                  ? array[i].call(mom, format)
                  : array[i];
          }
          return output;
      };
  }

  // format date using native date object
  function formatMoment(m, format) {
      if (!m.isValid()) {
          return m.localeData().invalidDate();
      }

      format = expandFormat(format, m.localeData());
      formatFunctions[format] =
          formatFunctions[format] || makeFormatFunction(format);

      return formatFunctions[format](m);
  }

  function expandFormat(format, locale) {
      var i = 5;

      function replaceLongDateFormatTokens(input) {
          return locale.longDateFormat(input) || input;
      }

      localFormattingTokens.lastIndex = 0;
      while (i >= 0 && localFormattingTokens.test(format)) {
          format = format.replace(
              localFormattingTokens,
              replaceLongDateFormatTokens
          );
          localFormattingTokens.lastIndex = 0;
          i -= 1;
      }

      return format;
  }

  var defaultLongDateFormat = {
      LTS: 'h:mm:ss A',
      LT: 'h:mm A',
      L: 'MM/DD/YYYY',
      LL: 'MMMM D, YYYY',
      LLL: 'MMMM D, YYYY h:mm A',
      LLLL: 'dddd, MMMM D, YYYY h:mm A',
  };

  function longDateFormat(key) {
      var format = this._longDateFormat[key],
          formatUpper = this._longDateFormat[key.toUpperCase()];

      if (format || !formatUpper) {
          return format;
      }

      this._longDateFormat[key] = formatUpper
          .match(formattingTokens)
          .map(function (tok) {
              if (
                  tok === 'MMMM' ||
                  tok === 'MM' ||
                  tok === 'DD' ||
                  tok === 'dddd'
              ) {
                  return tok.slice(1);
              }
              return tok;
          })
          .join('');

      return this._longDateFormat[key];
  }

  var defaultInvalidDate = 'Invalid date';

  function invalidDate() {
      return this._invalidDate;
  }

  var defaultOrdinal = '%d',
      defaultDayOfMonthOrdinalParse = /\d{1,2}/;

  function ordinal(number) {
      return this._ordinal.replace('%d', number);
  }

  var defaultRelativeTime = {
      future: 'in %s',
      past: '%s ago',
      s: 'a few seconds',
      ss: '%d seconds',
      m: 'a minute',
      mm: '%d minutes',
      h: 'an hour',
      hh: '%d hours',
      d: 'a day',
      dd: '%d days',
      w: 'a week',
      ww: '%d weeks',
      M: 'a month',
      MM: '%d months',
      y: 'a year',
      yy: '%d years',
  };

  function relativeTime(number, withoutSuffix, string, isFuture) {
      var output = this._relativeTime[string];
      return isFunction(output)
          ? output(number, withoutSuffix, string, isFuture)
          : output.replace(/%d/i, number);
  }

  function pastFuture(diff, output) {
      var format = this._relativeTime[diff > 0 ? 'future' : 'past'];
      return isFunction(format) ? format(output) : format.replace(/%s/i, output);
  }

  var aliases = {};

  function addUnitAlias(unit, shorthand) {
      var lowerCase = unit.toLowerCase();
      aliases[lowerCase] = aliases[lowerCase + 's'] = aliases[shorthand] = unit;
  }

  function normalizeUnits(units) {
      return typeof units === 'string'
          ? aliases[units] || aliases[units.toLowerCase()]
          : undefined;
  }

  function normalizeObjectUnits(inputObject) {
      var normalizedInput = {},
          normalizedProp,
          prop;

      for (prop in inputObject) {
          if (hasOwnProp(inputObject, prop)) {
              normalizedProp = normalizeUnits(prop);
              if (normalizedProp) {
                  normalizedInput[normalizedProp] = inputObject[prop];
              }
          }
      }

      return normalizedInput;
  }

  var priorities = {};

  function addUnitPriority(unit, priority) {
      priorities[unit] = priority;
  }

  function getPrioritizedUnits(unitsObj) {
      var units = [],
          u;
      for (u in unitsObj) {
          if (hasOwnProp(unitsObj, u)) {
              units.push({ unit: u, priority: priorities[u] });
          }
      }
      units.sort(function (a, b) {
          return a.priority - b.priority;
      });
      return units;
  }

  function isLeapYear(year) {
      return (year % 4 === 0 && year % 100 !== 0) || year % 400 === 0;
  }

  function absFloor(number) {
      if (number < 0) {
          // -0 -> 0
          return Math.ceil(number) || 0;
      } else {
          return Math.floor(number);
      }
  }

  function toInt(argumentForCoercion) {
      var coercedNumber = +argumentForCoercion,
          value = 0;

      if (coercedNumber !== 0 && isFinite(coercedNumber)) {
          value = absFloor(coercedNumber);
      }

      return value;
  }

  function makeGetSet(unit, keepTime) {
      return function (value) {
          if (value != null) {
              set$1(this, unit, value);
              hooks.updateOffset(this, keepTime);
              return this;
          } else {
              return get(this, unit);
          }
      };
  }

  function get(mom, unit) {
      return mom.isValid()
          ? mom._d['get' + (mom._isUTC ? 'UTC' : '') + unit]()
          : NaN;
  }

  function set$1(mom, unit, value) {
      if (mom.isValid() && !isNaN(value)) {
          if (
              unit === 'FullYear' &&
              isLeapYear(mom.year()) &&
              mom.month() === 1 &&
              mom.date() === 29
          ) {
              value = toInt(value);
              mom._d['set' + (mom._isUTC ? 'UTC' : '') + unit](
                  value,
                  mom.month(),
                  daysInMonth(value, mom.month())
              );
          } else {
              mom._d['set' + (mom._isUTC ? 'UTC' : '') + unit](value);
          }
      }
  }

  // MOMENTS

  function stringGet(units) {
      units = normalizeUnits(units);
      if (isFunction(this[units])) {
          return this[units]();
      }
      return this;
  }

  function stringSet(units, value) {
      if (typeof units === 'object') {
          units = normalizeObjectUnits(units);
          var prioritized = getPrioritizedUnits(units),
              i,
              prioritizedLen = prioritized.length;
          for (i = 0; i < prioritizedLen; i++) {
              this[prioritized[i].unit](units[prioritized[i].unit]);
          }
      } else {
          units = normalizeUnits(units);
          if (isFunction(this[units])) {
              return this[units](value);
          }
      }
      return this;
  }

  var match1 = /\d/, //       0 - 9
      match2 = /\d\d/, //      00 - 99
      match3 = /\d{3}/, //     000 - 999
      match4 = /\d{4}/, //    0000 - 9999
      match6 = /[+-]?\d{6}/, // -999999 - 999999
      match1to2 = /\d\d?/, //       0 - 99
      match3to4 = /\d\d\d\d?/, //     999 - 9999
      match5to6 = /\d\d\d\d\d\d?/, //   99999 - 999999
      match1to3 = /\d{1,3}/, //       0 - 999
      match1to4 = /\d{1,4}/, //       0 - 9999
      match1to6 = /[+-]?\d{1,6}/, // -999999 - 999999
      matchUnsigned = /\d+/, //       0 - inf
      matchSigned = /[+-]?\d+/, //    -inf - inf
      matchOffset = /Z|[+-]\d\d:?\d\d/gi, // +00:00 -00:00 +0000 -0000 or Z
      matchShortOffset = /Z|[+-]\d\d(?::?\d\d)?/gi, // +00 -00 +00:00 -00:00 +0000 -0000 or Z
      matchTimestamp = /[+-]?\d+(\.\d{1,3})?/, // 123456789 123456789.123
      // any word (or two) characters or numbers including two/three word month in arabic.
      // includes scottish gaelic two word and hyphenated months
      matchWord =
          /[0-9]{0,256}['a-z\u00A0-\u05FF\u0700-\uD7FF\uF900-\uFDCF\uFDF0-\uFF07\uFF10-\uFFEF]{1,256}|[\u0600-\u06FF\/]{1,256}(\s*?[\u0600-\u06FF]{1,256}){1,2}/i,
      regexes;

  regexes = {};

  function addRegexToken(token, regex, strictRegex) {
      regexes[token] = isFunction(regex)
          ? regex
          : function (isStrict, localeData) {
                return isStrict && strictRegex ? strictRegex : regex;
            };
  }

  function getParseRegexForToken(token, config) {
      if (!hasOwnProp(regexes, token)) {
          return new RegExp(unescapeFormat(token));
      }

      return regexes[token](config._strict, config._locale);
  }

  // Code from http://stackoverflow.com/questions/3561493/is-there-a-regexp-escape-function-in-javascript
  function unescapeFormat(s) {
      return regexEscape(
          s
              .replace('\\', '')
              .replace(
                  /\\(\[)|\\(\])|\[([^\]\[]*)\]|\\(.)/g,
                  function (matched, p1, p2, p3, p4) {
                      return p1 || p2 || p3 || p4;
                  }
              )
      );
  }

  function regexEscape(s) {
      return s.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
  }

  var tokens = {};

  function addParseToken(token, callback) {
      var i,
          func = callback,
          tokenLen;
      if (typeof token === 'string') {
          token = [token];
      }
      if (isNumber(callback)) {
          func = function (input, array) {
              array[callback] = toInt(input);
          };
      }
      tokenLen = token.length;
      for (i = 0; i < tokenLen; i++) {
          tokens[token[i]] = func;
      }
  }

  function addWeekParseToken(token, callback) {
      addParseToken(token, function (input, array, config, token) {
          config._w = config._w || {};
          callback(input, config._w, config, token);
      });
  }

  function addTimeToArrayFromToken(token, input, config) {
      if (input != null && hasOwnProp(tokens, token)) {
          tokens[token](input, config._a, config, token);
      }
  }

  var YEAR = 0,
      MONTH = 1,
      DATE = 2,
      HOUR = 3,
      MINUTE = 4,
      SECOND = 5,
      MILLISECOND = 6,
      WEEK = 7,
      WEEKDAY = 8;

  function mod(n, x) {
      return ((n % x) + x) % x;
  }

  var indexOf;

  if (Array.prototype.indexOf) {
      indexOf = Array.prototype.indexOf;
  } else {
      indexOf = function (o) {
          // I know
          var i;
          for (i = 0; i < this.length; ++i) {
              if (this[i] === o) {
                  return i;
              }
          }
          return -1;
      };
  }

  function daysInMonth(year, month) {
      if (isNaN(year) || isNaN(month)) {
          return NaN;
      }
      var modMonth = mod(month, 12);
      year += (month - modMonth) / 12;
      return modMonth === 1
          ? isLeapYear(year)
              ? 29
              : 28
          : 31 - ((modMonth % 7) % 2);
  }

  // FORMATTING

  addFormatToken('M', ['MM', 2], 'Mo', function () {
      return this.month() + 1;
  });

  addFormatToken('MMM', 0, 0, function (format) {
      return this.localeData().monthsShort(this, format);
  });

  addFormatToken('MMMM', 0, 0, function (format) {
      return this.localeData().months(this, format);
  });

  // ALIASES

  addUnitAlias('month', 'M');

  // PRIORITY

  addUnitPriority('month', 8);

  // PARSING

  addRegexToken('M', match1to2);
  addRegexToken('MM', match1to2, match2);
  addRegexToken('MMM', function (isStrict, locale) {
      return locale.monthsShortRegex(isStrict);
  });
  addRegexToken('MMMM', function (isStrict, locale) {
      return locale.monthsRegex(isStrict);
  });

  addParseToken(['M', 'MM'], function (input, array) {
      array[MONTH] = toInt(input) - 1;
  });

  addParseToken(['MMM', 'MMMM'], function (input, array, config, token) {
      var month = config._locale.monthsParse(input, token, config._strict);
      // if we didn't find a month name, mark the date as invalid.
      if (month != null) {
          array[MONTH] = month;
      } else {
          getParsingFlags(config).invalidMonth = input;
      }
  });

  // LOCALES

  var defaultLocaleMonths =
          'January_February_March_April_May_June_July_August_September_October_November_December'.split(
              '_'
          ),
      defaultLocaleMonthsShort =
          'Jan_Feb_Mar_Apr_May_Jun_Jul_Aug_Sep_Oct_Nov_Dec'.split('_'),
      MONTHS_IN_FORMAT = /D[oD]?(\[[^\[\]]*\]|\s)+MMMM?/,
      defaultMonthsShortRegex = matchWord,
      defaultMonthsRegex = matchWord;

  function localeMonths(m, format) {
      if (!m) {
          return isArray(this._months)
              ? this._months
              : this._months['standalone'];
      }
      return isArray(this._months)
          ? this._months[m.month()]
          : this._months[
                (this._months.isFormat || MONTHS_IN_FORMAT).test(format)
                    ? 'format'
                    : 'standalone'
            ][m.month()];
  }

  function localeMonthsShort(m, format) {
      if (!m) {
          return isArray(this._monthsShort)
              ? this._monthsShort
              : this._monthsShort['standalone'];
      }
      return isArray(this._monthsShort)
          ? this._monthsShort[m.month()]
          : this._monthsShort[
                MONTHS_IN_FORMAT.test(format) ? 'format' : 'standalone'
            ][m.month()];
  }

  function handleStrictParse(monthName, format, strict) {
      var i,
          ii,
          mom,
          llc = monthName.toLocaleLowerCase();
      if (!this._monthsParse) {
          // this is not used
          this._monthsParse = [];
          this._longMonthsParse = [];
          this._shortMonthsParse = [];
          for (i = 0; i < 12; ++i) {
              mom = createUTC([2000, i]);
              this._shortMonthsParse[i] = this.monthsShort(
                  mom,
                  ''
              ).toLocaleLowerCase();
              this._longMonthsParse[i] = this.months(mom, '').toLocaleLowerCase();
          }
      }

      if (strict) {
          if (format === 'MMM') {
              ii = indexOf.call(this._shortMonthsParse, llc);
              return ii !== -1 ? ii : null;
          } else {
              ii = indexOf.call(this._longMonthsParse, llc);
              return ii !== -1 ? ii : null;
          }
      } else {
          if (format === 'MMM') {
              ii = indexOf.call(this._shortMonthsParse, llc);
              if (ii !== -1) {
                  return ii;
              }
              ii = indexOf.call(this._longMonthsParse, llc);
              return ii !== -1 ? ii : null;
          } else {
              ii = indexOf.call(this._longMonthsParse, llc);
              if (ii !== -1) {
                  return ii;
              }
              ii = indexOf.call(this._shortMonthsParse, llc);
              return ii !== -1 ? ii : null;
          }
      }
  }

  function localeMonthsParse(monthName, format, strict) {
      var i, mom, regex;

      if (this._monthsParseExact) {
          return handleStrictParse.call(this, monthName, format, strict);
      }

      if (!this._monthsParse) {
          this._monthsParse = [];
          this._longMonthsParse = [];
          this._shortMonthsParse = [];
      }

      // TODO: add sorting
      // Sorting makes sure if one month (or abbr) is a prefix of another
      // see sorting in computeMonthsParse
      for (i = 0; i < 12; i++) {
          // make the regex if we don't have it already
          mom = createUTC([2000, i]);
          if (strict && !this._longMonthsParse[i]) {
              this._longMonthsParse[i] = new RegExp(
                  '^' + this.months(mom, '').replace('.', '') + '$',
                  'i'
              );
              this._shortMonthsParse[i] = new RegExp(
                  '^' + this.monthsShort(mom, '').replace('.', '') + '$',
                  'i'
              );
          }
          if (!strict && !this._monthsParse[i]) {
              regex =
                  '^' + this.months(mom, '') + '|^' + this.monthsShort(mom, '');
              this._monthsParse[i] = new RegExp(regex.replace('.', ''), 'i');
          }
          // test the regex
          if (
              strict &&
              format === 'MMMM' &&
              this._longMonthsParse[i].test(monthName)
          ) {
              return i;
          } else if (
              strict &&
              format === 'MMM' &&
              this._shortMonthsParse[i].test(monthName)
          ) {
              return i;
          } else if (!strict && this._monthsParse[i].test(monthName)) {
              return i;
          }
      }
  }

  // MOMENTS

  function setMonth(mom, value) {
      var dayOfMonth;

      if (!mom.isValid()) {
          // No op
          return mom;
      }

      if (typeof value === 'string') {
          if (/^\d+$/.test(value)) {
              value = toInt(value);
          } else {
              value = mom.localeData().monthsParse(value);
              // TODO: Another silent failure?
              if (!isNumber(value)) {
                  return mom;
              }
          }
      }

      dayOfMonth = Math.min(mom.date(), daysInMonth(mom.year(), value));
      mom._d['set' + (mom._isUTC ? 'UTC' : '') + 'Month'](value, dayOfMonth);
      return mom;
  }

  function getSetMonth(value) {
      if (value != null) {
          setMonth(this, value);
          hooks.updateOffset(this, true);
          return this;
      } else {
          return get(this, 'Month');
      }
  }

  function getDaysInMonth() {
      return daysInMonth(this.year(), this.month());
  }

  function monthsShortRegex(isStrict) {
      if (this._monthsParseExact) {
          if (!hasOwnProp(this, '_monthsRegex')) {
              computeMonthsParse.call(this);
          }
          if (isStrict) {
              return this._monthsShortStrictRegex;
          } else {
              return this._monthsShortRegex;
          }
      } else {
          if (!hasOwnProp(this, '_monthsShortRegex')) {
              this._monthsShortRegex = defaultMonthsShortRegex;
          }
          return this._monthsShortStrictRegex && isStrict
              ? this._monthsShortStrictRegex
              : this._monthsShortRegex;
      }
  }

  function monthsRegex(isStrict) {
      if (this._monthsParseExact) {
          if (!hasOwnProp(this, '_monthsRegex')) {
              computeMonthsParse.call(this);
          }
          if (isStrict) {
              return this._monthsStrictRegex;
          } else {
              return this._monthsRegex;
          }
      } else {
          if (!hasOwnProp(this, '_monthsRegex')) {
              this._monthsRegex = defaultMonthsRegex;
          }
          return this._monthsStrictRegex && isStrict
              ? this._monthsStrictRegex
              : this._monthsRegex;
      }
  }

  function computeMonthsParse() {
      function cmpLenRev(a, b) {
          return b.length - a.length;
      }

      var shortPieces = [],
          longPieces = [],
          mixedPieces = [],
          i,
          mom;
      for (i = 0; i < 12; i++) {
          // make the regex if we don't have it already
          mom = createUTC([2000, i]);
          shortPieces.push(this.monthsShort(mom, ''));
          longPieces.push(this.months(mom, ''));
          mixedPieces.push(this.months(mom, ''));
          mixedPieces.push(this.monthsShort(mom, ''));
      }
      // Sorting makes sure if one month (or abbr) is a prefix of another it
      // will match the longer piece.
      shortPieces.sort(cmpLenRev);
      longPieces.sort(cmpLenRev);
      mixedPieces.sort(cmpLenRev);
      for (i = 0; i < 12; i++) {
          shortPieces[i] = regexEscape(shortPieces[i]);
          longPieces[i] = regexEscape(longPieces[i]);
      }
      for (i = 0; i < 24; i++) {
          mixedPieces[i] = regexEscape(mixedPieces[i]);
      }

      this._monthsRegex = new RegExp('^(' + mixedPieces.join('|') + ')', 'i');
      this._monthsShortRegex = this._monthsRegex;
      this._monthsStrictRegex = new RegExp(
          '^(' + longPieces.join('|') + ')',
          'i'
      );
      this._monthsShortStrictRegex = new RegExp(
          '^(' + shortPieces.join('|') + ')',
          'i'
      );
  }

  // FORMATTING

  addFormatToken('Y', 0, 0, function () {
      var y = this.year();
      return y <= 9999 ? zeroFill(y, 4) : '+' + y;
  });

  addFormatToken(0, ['YY', 2], 0, function () {
      return this.year() % 100;
  });

  addFormatToken(0, ['YYYY', 4], 0, 'year');
  addFormatToken(0, ['YYYYY', 5], 0, 'year');
  addFormatToken(0, ['YYYYYY', 6, true], 0, 'year');

  // ALIASES

  addUnitAlias('year', 'y');

  // PRIORITIES

  addUnitPriority('year', 1);

  // PARSING

  addRegexToken('Y', matchSigned);
  addRegexToken('YY', match1to2, match2);
  addRegexToken('YYYY', match1to4, match4);
  addRegexToken('YYYYY', match1to6, match6);
  addRegexToken('YYYYYY', match1to6, match6);

  addParseToken(['YYYYY', 'YYYYYY'], YEAR);
  addParseToken('YYYY', function (input, array) {
      array[YEAR] =
          input.length === 2 ? hooks.parseTwoDigitYear(input) : toInt(input);
  });
  addParseToken('YY', function (input, array) {
      array[YEAR] = hooks.parseTwoDigitYear(input);
  });
  addParseToken('Y', function (input, array) {
      array[YEAR] = parseInt(input, 10);
  });

  // HELPERS

  function daysInYear(year) {
      return isLeapYear(year) ? 366 : 365;
  }

  // HOOKS

  hooks.parseTwoDigitYear = function (input) {
      return toInt(input) + (toInt(input) > 68 ? 1900 : 2000);
  };

  // MOMENTS

  var getSetYear = makeGetSet('FullYear', true);

  function getIsLeapYear() {
      return isLeapYear(this.year());
  }

  function createDate(y, m, d, h, M, s, ms) {
      // can't just apply() to create a date:
      // https://stackoverflow.com/q/181348
      var date;
      // the date constructor remaps years 0-99 to 1900-1999
      if (y < 100 && y >= 0) {
          // preserve leap years using a full 400 year cycle, then reset
          date = new Date(y + 400, m, d, h, M, s, ms);
          if (isFinite(date.getFullYear())) {
              date.setFullYear(y);
          }
      } else {
          date = new Date(y, m, d, h, M, s, ms);
      }

      return date;
  }

  function createUTCDate(y) {
      var date, args;
      // the Date.UTC function remaps years 0-99 to 1900-1999
      if (y < 100 && y >= 0) {
          args = Array.prototype.slice.call(arguments);
          // preserve leap years using a full 400 year cycle, then reset
          args[0] = y + 400;
          date = new Date(Date.UTC.apply(null, args));
          if (isFinite(date.getUTCFullYear())) {
              date.setUTCFullYear(y);
          }
      } else {
          date = new Date(Date.UTC.apply(null, arguments));
      }

      return date;
  }

  // start-of-first-week - start-of-year
  function firstWeekOffset(year, dow, doy) {
      var // first-week day -- which january is always in the first week (4 for iso, 1 for other)
          fwd = 7 + dow - doy,
          // first-week day local weekday -- which local weekday is fwd
          fwdlw = (7 + createUTCDate(year, 0, fwd).getUTCDay() - dow) % 7;

      return -fwdlw + fwd - 1;
  }

  // https://en.wikipedia.org/wiki/ISO_week_date#Calculating_a_date_given_the_year.2C_week_number_and_weekday
  function dayOfYearFromWeeks(year, week, weekday, dow, doy) {
      var localWeekday = (7 + weekday - dow) % 7,
          weekOffset = firstWeekOffset(year, dow, doy),
          dayOfYear = 1 + 7 * (week - 1) + localWeekday + weekOffset,
          resYear,
          resDayOfYear;

      if (dayOfYear <= 0) {
          resYear = year - 1;
          resDayOfYear = daysInYear(resYear) + dayOfYear;
      } else if (dayOfYear > daysInYear(year)) {
          resYear = year + 1;
          resDayOfYear = dayOfYear - daysInYear(year);
      } else {
          resYear = year;
          resDayOfYear = dayOfYear;
      }

      return {
          year: resYear,
          dayOfYear: resDayOfYear,
      };
  }

  function weekOfYear(mom, dow, doy) {
      var weekOffset = firstWeekOffset(mom.year(), dow, doy),
          week = Math.floor((mom.dayOfYear() - weekOffset - 1) / 7) + 1,
          resWeek,
          resYear;

      if (week < 1) {
          resYear = mom.year() - 1;
          resWeek = week + weeksInYear(resYear, dow, doy);
      } else if (week > weeksInYear(mom.year(), dow, doy)) {
          resWeek = week - weeksInYear(mom.year(), dow, doy);
          resYear = mom.year() + 1;
      } else {
          resYear = mom.year();
          resWeek = week;
      }

      return {
          week: resWeek,
          year: resYear,
      };
  }

  function weeksInYear(year, dow, doy) {
      var weekOffset = firstWeekOffset(year, dow, doy),
          weekOffsetNext = firstWeekOffset(year + 1, dow, doy);
      return (daysInYear(year) - weekOffset + weekOffsetNext) / 7;
  }

  // FORMATTING

  addFormatToken('w', ['ww', 2], 'wo', 'week');
  addFormatToken('W', ['WW', 2], 'Wo', 'isoWeek');

  // ALIASES

  addUnitAlias('week', 'w');
  addUnitAlias('isoWeek', 'W');

  // PRIORITIES

  addUnitPriority('week', 5);
  addUnitPriority('isoWeek', 5);

  // PARSING

  addRegexToken('w', match1to2);
  addRegexToken('ww', match1to2, match2);
  addRegexToken('W', match1to2);
  addRegexToken('WW', match1to2, match2);

  addWeekParseToken(
      ['w', 'ww', 'W', 'WW'],
      function (input, week, config, token) {
          week[token.substr(0, 1)] = toInt(input);
      }
  );

  // HELPERS

  // LOCALES

  function localeWeek(mom) {
      return weekOfYear(mom, this._week.dow, this._week.doy).week;
  }

  var defaultLocaleWeek = {
      dow: 0, // Sunday is the first day of the week.
      doy: 6, // The week that contains Jan 6th is the first week of the year.
  };

  function localeFirstDayOfWeek() {
      return this._week.dow;
  }

  function localeFirstDayOfYear() {
      return this._week.doy;
  }

  // MOMENTS

  function getSetWeek(input) {
      var week = this.localeData().week(this);
      return input == null ? week : this.add((input - week) * 7, 'd');
  }

  function getSetISOWeek(input) {
      var week = weekOfYear(this, 1, 4).week;
      return input == null ? week : this.add((input - week) * 7, 'd');
  }

  // FORMATTING

  addFormatToken('d', 0, 'do', 'day');

  addFormatToken('dd', 0, 0, function (format) {
      return this.localeData().weekdaysMin(this, format);
  });

  addFormatToken('ddd', 0, 0, function (format) {
      return this.localeData().weekdaysShort(this, format);
  });

  addFormatToken('dddd', 0, 0, function (format) {
      return this.localeData().weekdays(this, format);
  });

  addFormatToken('e', 0, 0, 'weekday');
  addFormatToken('E', 0, 0, 'isoWeekday');

  // ALIASES

  addUnitAlias('day', 'd');
  addUnitAlias('weekday', 'e');
  addUnitAlias('isoWeekday', 'E');

  // PRIORITY
  addUnitPriority('day', 11);
  addUnitPriority('weekday', 11);
  addUnitPriority('isoWeekday', 11);

  // PARSING

  addRegexToken('d', match1to2);
  addRegexToken('e', match1to2);
  addRegexToken('E', match1to2);
  addRegexToken('dd', function (isStrict, locale) {
      return locale.weekdaysMinRegex(isStrict);
  });
  addRegexToken('ddd', function (isStrict, locale) {
      return locale.weekdaysShortRegex(isStrict);
  });
  addRegexToken('dddd', function (isStrict, locale) {
      return locale.weekdaysRegex(isStrict);
  });

  addWeekParseToken(['dd', 'ddd', 'dddd'], function (input, week, config, token) {
      var weekday = config._locale.weekdaysParse(input, token, config._strict);
      // if we didn't get a weekday name, mark the date as invalid
      if (weekday != null) {
          week.d = weekday;
      } else {
          getParsingFlags(config).invalidWeekday = input;
      }
  });

  addWeekParseToken(['d', 'e', 'E'], function (input, week, config, token) {
      week[token] = toInt(input);
  });

  // HELPERS

  function parseWeekday(input, locale) {
      if (typeof input !== 'string') {
          return input;
      }

      if (!isNaN(input)) {
          return parseInt(input, 10);
      }

      input = locale.weekdaysParse(input);
      if (typeof input === 'number') {
          return input;
      }

      return null;
  }

  function parseIsoWeekday(input, locale) {
      if (typeof input === 'string') {
          return locale.weekdaysParse(input) % 7 || 7;
      }
      return isNaN(input) ? null : input;
  }

  // LOCALES
  function shiftWeekdays(ws, n) {
      return ws.slice(n, 7).concat(ws.slice(0, n));
  }

  var defaultLocaleWeekdays =
          'Sunday_Monday_Tuesday_Wednesday_Thursday_Friday_Saturday'.split('_'),
      defaultLocaleWeekdaysShort = 'Sun_Mon_Tue_Wed_Thu_Fri_Sat'.split('_'),
      defaultLocaleWeekdaysMin = 'Su_Mo_Tu_We_Th_Fr_Sa'.split('_'),
      defaultWeekdaysRegex = matchWord,
      defaultWeekdaysShortRegex = matchWord,
      defaultWeekdaysMinRegex = matchWord;

  function localeWeekdays(m, format) {
      var weekdays = isArray(this._weekdays)
          ? this._weekdays
          : this._weekdays[
                m && m !== true && this._weekdays.isFormat.test(format)
                    ? 'format'
                    : 'standalone'
            ];
      return m === true
          ? shiftWeekdays(weekdays, this._week.dow)
          : m
          ? weekdays[m.day()]
          : weekdays;
  }

  function localeWeekdaysShort(m) {
      return m === true
          ? shiftWeekdays(this._weekdaysShort, this._week.dow)
          : m
          ? this._weekdaysShort[m.day()]
          : this._weekdaysShort;
  }

  function localeWeekdaysMin(m) {
      return m === true
          ? shiftWeekdays(this._weekdaysMin, this._week.dow)
          : m
          ? this._weekdaysMin[m.day()]
          : this._weekdaysMin;
  }

  function handleStrictParse$1(weekdayName, format, strict) {
      var i,
          ii,
          mom,
          llc = weekdayName.toLocaleLowerCase();
      if (!this._weekdaysParse) {
          this._weekdaysParse = [];
          this._shortWeekdaysParse = [];
          this._minWeekdaysParse = [];

          for (i = 0; i < 7; ++i) {
              mom = createUTC([2000, 1]).day(i);
              this._minWeekdaysParse[i] = this.weekdaysMin(
                  mom,
                  ''
              ).toLocaleLowerCase();
              this._shortWeekdaysParse[i] = this.weekdaysShort(
                  mom,
                  ''
              ).toLocaleLowerCase();
              this._weekdaysParse[i] = this.weekdays(mom, '').toLocaleLowerCase();
          }
      }

      if (strict) {
          if (format === 'dddd') {
              ii = indexOf.call(this._weekdaysParse, llc);
              return ii !== -1 ? ii : null;
          } else if (format === 'ddd') {
              ii = indexOf.call(this._shortWeekdaysParse, llc);
              return ii !== -1 ? ii : null;
          } else {
              ii = indexOf.call(this._minWeekdaysParse, llc);
              return ii !== -1 ? ii : null;
          }
      } else {
          if (format === 'dddd') {
              ii = indexOf.call(this._weekdaysParse, llc);
              if (ii !== -1) {
                  return ii;
              }
              ii = indexOf.call(this._shortWeekdaysParse, llc);
              if (ii !== -1) {
                  return ii;
              }
              ii = indexOf.call(this._minWeekdaysParse, llc);
              return ii !== -1 ? ii : null;
          } else if (format === 'ddd') {
              ii = indexOf.call(this._shortWeekdaysParse, llc);
              if (ii !== -1) {
                  return ii;
              }
              ii = indexOf.call(this._weekdaysParse, llc);
              if (ii !== -1) {
                  return ii;
              }
              ii = indexOf.call(this._minWeekdaysParse, llc);
              return ii !== -1 ? ii : null;
          } else {
              ii = indexOf.call(this._minWeekdaysParse, llc);
              if (ii !== -1) {
                  return ii;
              }
              ii = indexOf.call(this._weekdaysParse, llc);
              if (ii !== -1) {
                  return ii;
              }
              ii = indexOf.call(this._shortWeekdaysParse, llc);
              return ii !== -1 ? ii : null;
          }
      }
  }

  function localeWeekdaysParse(weekdayName, format, strict) {
      var i, mom, regex;

      if (this._weekdaysParseExact) {
          return handleStrictParse$1.call(this, weekdayName, format, strict);
      }

      if (!this._weekdaysParse) {
          this._weekdaysParse = [];
          this._minWeekdaysParse = [];
          this._shortWeekdaysParse = [];
          this._fullWeekdaysParse = [];
      }

      for (i = 0; i < 7; i++) {
          // make the regex if we don't have it already

          mom = createUTC([2000, 1]).day(i);
          if (strict && !this._fullWeekdaysParse[i]) {
              this._fullWeekdaysParse[i] = new RegExp(
                  '^' + this.weekdays(mom, '').replace('.', '\\.?') + '$',
                  'i'
              );
              this._shortWeekdaysParse[i] = new RegExp(
                  '^' + this.weekdaysShort(mom, '').replace('.', '\\.?') + '$',
                  'i'
              );
              this._minWeekdaysParse[i] = new RegExp(
                  '^' + this.weekdaysMin(mom, '').replace('.', '\\.?') + '$',
                  'i'
              );
          }
          if (!this._weekdaysParse[i]) {
              regex =
                  '^' +
                  this.weekdays(mom, '') +
                  '|^' +
                  this.weekdaysShort(mom, '') +
                  '|^' +
                  this.weekdaysMin(mom, '');
              this._weekdaysParse[i] = new RegExp(regex.replace('.', ''), 'i');
          }
          // test the regex
          if (
              strict &&
              format === 'dddd' &&
              this._fullWeekdaysParse[i].test(weekdayName)
          ) {
              return i;
          } else if (
              strict &&
              format === 'ddd' &&
              this._shortWeekdaysParse[i].test(weekdayName)
          ) {
              return i;
          } else if (
              strict &&
              format === 'dd' &&
              this._minWeekdaysParse[i].test(weekdayName)
          ) {
              return i;
          } else if (!strict && this._weekdaysParse[i].test(weekdayName)) {
              return i;
          }
      }
  }

  // MOMENTS

  function getSetDayOfWeek(input) {
      if (!this.isValid()) {
          return input != null ? this : NaN;
      }
      var day = this._isUTC ? this._d.getUTCDay() : this._d.getDay();
      if (input != null) {
          input = parseWeekday(input, this.localeData());
          return this.add(input - day, 'd');
      } else {
          return day;
      }
  }

  function getSetLocaleDayOfWeek(input) {
      if (!this.isValid()) {
          return input != null ? this : NaN;
      }
      var weekday = (this.day() + 7 - this.localeData()._week.dow) % 7;
      return input == null ? weekday : this.add(input - weekday, 'd');
  }

  function getSetISODayOfWeek(input) {
      if (!this.isValid()) {
          return input != null ? this : NaN;
      }

      // behaves the same as moment#day except
      // as a getter, returns 7 instead of 0 (1-7 range instead of 0-6)
      // as a setter, sunday should belong to the previous week.

      if (input != null) {
          var weekday = parseIsoWeekday(input, this.localeData());
          return this.day(this.day() % 7 ? weekday : weekday - 7);
      } else {
          return this.day() || 7;
      }
  }

  function weekdaysRegex(isStrict) {
      if (this._weekdaysParseExact) {
          if (!hasOwnProp(this, '_weekdaysRegex')) {
              computeWeekdaysParse.call(this);
          }
          if (isStrict) {
              return this._weekdaysStrictRegex;
          } else {
              return this._weekdaysRegex;
          }
      } else {
          if (!hasOwnProp(this, '_weekdaysRegex')) {
              this._weekdaysRegex = defaultWeekdaysRegex;
          }
          return this._weekdaysStrictRegex && isStrict
              ? this._weekdaysStrictRegex
              : this._weekdaysRegex;
      }
  }

  function weekdaysShortRegex(isStrict) {
      if (this._weekdaysParseExact) {
          if (!hasOwnProp(this, '_weekdaysRegex')) {
              computeWeekdaysParse.call(this);
          }
          if (isStrict) {
              return this._weekdaysShortStrictRegex;
          } else {
              return this._weekdaysShortRegex;
          }
      } else {
          if (!hasOwnProp(this, '_weekdaysShortRegex')) {
              this._weekdaysShortRegex = defaultWeekdaysShortRegex;
          }
          return this._weekdaysShortStrictRegex && isStrict
              ? this._weekdaysShortStrictRegex
              : this._weekdaysShortRegex;
      }
  }

  function weekdaysMinRegex(isStrict) {
      if (this._weekdaysParseExact) {
          if (!hasOwnProp(this, '_weekdaysRegex')) {
              computeWeekdaysParse.call(this);
          }
          if (isStrict) {
              return this._weekdaysMinStrictRegex;
          } else {
              return this._weekdaysMinRegex;
          }
      } else {
          if (!hasOwnProp(this, '_weekdaysMinRegex')) {
              this._weekdaysMinRegex = defaultWeekdaysMinRegex;
          }
          return this._weekdaysMinStrictRegex && isStrict
              ? this._weekdaysMinStrictRegex
              : this._weekdaysMinRegex;
      }
  }

  function computeWeekdaysParse() {
      function cmpLenRev(a, b) {
          return b.length - a.length;
      }

      var minPieces = [],
          shortPieces = [],
          longPieces = [],
          mixedPieces = [],
          i,
          mom,
          minp,
          shortp,
          longp;
      for (i = 0; i < 7; i++) {
          // make the regex if we don't have it already
          mom = createUTC([2000, 1]).day(i);
          minp = regexEscape(this.weekdaysMin(mom, ''));
          shortp = regexEscape(this.weekdaysShort(mom, ''));
          longp = regexEscape(this.weekdays(mom, ''));
          minPieces.push(minp);
          shortPieces.push(shortp);
          longPieces.push(longp);
          mixedPieces.push(minp);
          mixedPieces.push(shortp);
          mixedPieces.push(longp);
      }
      // Sorting makes sure if one weekday (or abbr) is a prefix of another it
      // will match the longer piece.
      minPieces.sort(cmpLenRev);
      shortPieces.sort(cmpLenRev);
      longPieces.sort(cmpLenRev);
      mixedPieces.sort(cmpLenRev);

      this._weekdaysRegex = new RegExp('^(' + mixedPieces.join('|') + ')', 'i');
      this._weekdaysShortRegex = this._weekdaysRegex;
      this._weekdaysMinRegex = this._weekdaysRegex;

      this._weekdaysStrictRegex = new RegExp(
          '^(' + longPieces.join('|') + ')',
          'i'
      );
      this._weekdaysShortStrictRegex = new RegExp(
          '^(' + shortPieces.join('|') + ')',
          'i'
      );
      this._weekdaysMinStrictRegex = new RegExp(
          '^(' + minPieces.join('|') + ')',
          'i'
      );
  }

  // FORMATTING

  function hFormat() {
      return this.hours() % 12 || 12;
  }

  function kFormat() {
      return this.hours() || 24;
  }

  addFormatToken('H', ['HH', 2], 0, 'hour');
  addFormatToken('h', ['hh', 2], 0, hFormat);
  addFormatToken('k', ['kk', 2], 0, kFormat);

  addFormatToken('hmm', 0, 0, function () {
      return '' + hFormat.apply(this) + zeroFill(this.minutes(), 2);
  });

  addFormatToken('hmmss', 0, 0, function () {
      return (
          '' +
          hFormat.apply(this) +
          zeroFill(this.minutes(), 2) +
          zeroFill(this.seconds(), 2)
      );
  });

  addFormatToken('Hmm', 0, 0, function () {
      return '' + this.hours() + zeroFill(this.minutes(), 2);
  });

  addFormatToken('Hmmss', 0, 0, function () {
      return (
          '' +
          this.hours() +
          zeroFill(this.minutes(), 2) +
          zeroFill(this.seconds(), 2)
      );
  });

  function meridiem(token, lowercase) {
      addFormatToken(token, 0, 0, function () {
          return this.localeData().meridiem(
              this.hours(),
              this.minutes(),
              lowercase
          );
      });
  }

  meridiem('a', true);
  meridiem('A', false);

  // ALIASES

  addUnitAlias('hour', 'h');

  // PRIORITY
  addUnitPriority('hour', 13);

  // PARSING

  function matchMeridiem(isStrict, locale) {
      return locale._meridiemParse;
  }

  addRegexToken('a', matchMeridiem);
  addRegexToken('A', matchMeridiem);
  addRegexToken('H', match1to2);
  addRegexToken('h', match1to2);
  addRegexToken('k', match1to2);
  addRegexToken('HH', match1to2, match2);
  addRegexToken('hh', match1to2, match2);
  addRegexToken('kk', match1to2, match2);

  addRegexToken('hmm', match3to4);
  addRegexToken('hmmss', match5to6);
  addRegexToken('Hmm', match3to4);
  addRegexToken('Hmmss', match5to6);

  addParseToken(['H', 'HH'], HOUR);
  addParseToken(['k', 'kk'], function (input, array, config) {
      var kInput = toInt(input);
      array[HOUR] = kInput === 24 ? 0 : kInput;
  });
  addParseToken(['a', 'A'], function (input, array, config) {
      config._isPm = config._locale.isPM(input);
      config._meridiem = input;
  });
  addParseToken(['h', 'hh'], function (input, array, config) {
      array[HOUR] = toInt(input);
      getParsingFlags(config).bigHour = true;
  });
  addParseToken('hmm', function (input, array, config) {
      var pos = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos));
      array[MINUTE] = toInt(input.substr(pos));
      getParsingFlags(config).bigHour = true;
  });
  addParseToken('hmmss', function (input, array, config) {
      var pos1 = input.length - 4,
          pos2 = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos1));
      array[MINUTE] = toInt(input.substr(pos1, 2));
      array[SECOND] = toInt(input.substr(pos2));
      getParsingFlags(config).bigHour = true;
  });
  addParseToken('Hmm', function (input, array, config) {
      var pos = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos));
      array[MINUTE] = toInt(input.substr(pos));
  });
  addParseToken('Hmmss', function (input, array, config) {
      var pos1 = input.length - 4,
          pos2 = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos1));
      array[MINUTE] = toInt(input.substr(pos1, 2));
      array[SECOND] = toInt(input.substr(pos2));
  });

  // LOCALES

  function localeIsPM(input) {
      // IE8 Quirks Mode & IE7 Standards Mode do not allow accessing strings like arrays
      // Using charAt should be more compatible.
      return (input + '').toLowerCase().charAt(0) === 'p';
  }

  var defaultLocaleMeridiemParse = /[ap]\.?m?\.?/i,
      // Setting the hour should keep the time, because the user explicitly
      // specified which hour they want. So trying to maintain the same hour (in
      // a new timezone) makes sense. Adding/subtracting hours does not follow
      // this rule.
      getSetHour = makeGetSet('Hours', true);

  function localeMeridiem(hours, minutes, isLower) {
      if (hours > 11) {
          return isLower ? 'pm' : 'PM';
      } else {
          return isLower ? 'am' : 'AM';
      }
  }

  var baseConfig = {
      calendar: defaultCalendar,
      longDateFormat: defaultLongDateFormat,
      invalidDate: defaultInvalidDate,
      ordinal: defaultOrdinal,
      dayOfMonthOrdinalParse: defaultDayOfMonthOrdinalParse,
      relativeTime: defaultRelativeTime,

      months: defaultLocaleMonths,
      monthsShort: defaultLocaleMonthsShort,

      week: defaultLocaleWeek,

      weekdays: defaultLocaleWeekdays,
      weekdaysMin: defaultLocaleWeekdaysMin,
      weekdaysShort: defaultLocaleWeekdaysShort,

      meridiemParse: defaultLocaleMeridiemParse,
  };

  // internal storage for locale config files
  var locales = {},
      localeFamilies = {},
      globalLocale;

  function commonPrefix(arr1, arr2) {
      var i,
          minl = Math.min(arr1.length, arr2.length);
      for (i = 0; i < minl; i += 1) {
          if (arr1[i] !== arr2[i]) {
              return i;
          }
      }
      return minl;
  }

  function normalizeLocale(key) {
      return key ? key.toLowerCase().replace('_', '-') : key;
  }

  // pick the locale from the array
  // try ['en-au', 'en-gb'] as 'en-au', 'en-gb', 'en', as in move through the list trying each
  // substring from most specific to least, but move to the next array item if it's a more specific variant than the current root
  function chooseLocale(names) {
      var i = 0,
          j,
          next,
          locale,
          split;

      while (i < names.length) {
          split = normalizeLocale(names[i]).split('-');
          j = split.length;
          next = normalizeLocale(names[i + 1]);
          next = next ? next.split('-') : null;
          while (j > 0) {
              locale = loadLocale(split.slice(0, j).join('-'));
              if (locale) {
                  return locale;
              }
              if (
                  next &&
                  next.length >= j &&
                  commonPrefix(split, next) >= j - 1
              ) {
                  //the next array item is better than a shallower substring of this one
                  break;
              }
              j--;
          }
          i++;
      }
      return globalLocale;
  }

  function isLocaleNameSane(name) {
      // Prevent names that look like filesystem paths, i.e contain '/' or '\'
      return name.match('^[^/\\\\]*$') != null;
  }

  function loadLocale(name) {
      var oldLocale = null,
          aliasedRequire;
      // TODO: Find a better way to register and load all the locales in Node
      if (
          locales[name] === undefined &&
          typeof module !== 'undefined' &&
          module &&
          module.exports &&
          isLocaleNameSane(name)
      ) {
          try {
              oldLocale = globalLocale._abbr;
              aliasedRequire = require;
              aliasedRequire('./locale/' + name);
              getSetGlobalLocale(oldLocale);
          } catch (e) {
              // mark as not found to avoid repeating expensive file require call causing high CPU
              // when trying to find en-US, en_US, en-us for every format call
              locales[name] = null; // null means not found
          }
      }
      return locales[name];
  }

  // This function will load locale and then set the global locale.  If
  // no arguments are passed in, it will simply return the current global
  // locale key.
  function getSetGlobalLocale(key, values) {
      var data;
      if (key) {
          if (isUndefined(values)) {
              data = getLocale(key);
          } else {
              data = defineLocale(key, values);
          }

          if (data) {
              // moment.duration._locale = moment._locale = data;
              globalLocale = data;
          } else {
              if (typeof console !== 'undefined' && console.warn) {
                  //warn user if arguments are passed but the locale could not be set
                  console.warn(
                      'Locale ' + key + ' not found. Did you forget to load it?'
                  );
              }
          }
      }

      return globalLocale._abbr;
  }

  function defineLocale(name, config) {
      if (config !== null) {
          var locale,
              parentConfig = baseConfig;
          config.abbr = name;
          if (locales[name] != null) {
              deprecateSimple(
                  'defineLocaleOverride',
                  'use moment.updateLocale(localeName, config) to change ' +
                      'an existing locale. moment.defineLocale(localeName, ' +
                      'config) should only be used for creating a new locale ' +
                      'See http://momentjs.com/guides/#/warnings/define-locale/ for more info.'
              );
              parentConfig = locales[name]._config;
          } else if (config.parentLocale != null) {
              if (locales[config.parentLocale] != null) {
                  parentConfig = locales[config.parentLocale]._config;
              } else {
                  locale = loadLocale(config.parentLocale);
                  if (locale != null) {
                      parentConfig = locale._config;
                  } else {
                      if (!localeFamilies[config.parentLocale]) {
                          localeFamilies[config.parentLocale] = [];
                      }
                      localeFamilies[config.parentLocale].push({
                          name: name,
                          config: config,
                      });
                      return null;
                  }
              }
          }
          locales[name] = new Locale(mergeConfigs(parentConfig, config));

          if (localeFamilies[name]) {
              localeFamilies[name].forEach(function (x) {
                  defineLocale(x.name, x.config);
              });
          }

          // backwards compat for now: also set the locale
          // make sure we set the locale AFTER all child locales have been
          // created, so we won't end up with the child locale set.
          getSetGlobalLocale(name);

          return locales[name];
      } else {
          // useful for testing
          delete locales[name];
          return null;
      }
  }

  function updateLocale(name, config) {
      if (config != null) {
          var locale,
              tmpLocale,
              parentConfig = baseConfig;

          if (locales[name] != null && locales[name].parentLocale != null) {
              // Update existing child locale in-place to avoid memory-leaks
              locales[name].set(mergeConfigs(locales[name]._config, config));
          } else {
              // MERGE
              tmpLocale = loadLocale(name);
              if (tmpLocale != null) {
                  parentConfig = tmpLocale._config;
              }
              config = mergeConfigs(parentConfig, config);
              if (tmpLocale == null) {
                  // updateLocale is called for creating a new locale
                  // Set abbr so it will have a name (getters return
                  // undefined otherwise).
                  config.abbr = name;
              }
              locale = new Locale(config);
              locale.parentLocale = locales[name];
              locales[name] = locale;
          }

          // backwards compat for now: also set the locale
          getSetGlobalLocale(name);
      } else {
          // pass null for config to unupdate, useful for tests
          if (locales[name] != null) {
              if (locales[name].parentLocale != null) {
                  locales[name] = locales[name].parentLocale;
                  if (name === getSetGlobalLocale()) {
                      getSetGlobalLocale(name);
                  }
              } else if (locales[name] != null) {
                  delete locales[name];
              }
          }
      }
      return locales[name];
  }

  // returns locale data
  function getLocale(key) {
      var locale;

      if (key && key._locale && key._locale._abbr) {
          key = key._locale._abbr;
      }

      if (!key) {
          return globalLocale;
      }

      if (!isArray(key)) {
          //short-circuit everything else
          locale = loadLocale(key);
          if (locale) {
              return locale;
          }
          key = [key];
      }

      return chooseLocale(key);
  }

  function listLocales() {
      return keys(locales);
  }

  function checkOverflow(m) {
      var overflow,
          a = m._a;

      if (a && getParsingFlags(m).overflow === -2) {
          overflow =
              a[MONTH] < 0 || a[MONTH] > 11
                  ? MONTH
                  : a[DATE] < 1 || a[DATE] > daysInMonth(a[YEAR], a[MONTH])
                  ? DATE
                  : a[HOUR] < 0 ||
                    a[HOUR] > 24 ||
                    (a[HOUR] === 24 &&
                        (a[MINUTE] !== 0 ||
                            a[SECOND] !== 0 ||
                            a[MILLISECOND] !== 0))
                  ? HOUR
                  : a[MINUTE] < 0 || a[MINUTE] > 59
                  ? MINUTE
                  : a[SECOND] < 0 || a[SECOND] > 59
                  ? SECOND
                  : a[MILLISECOND] < 0 || a[MILLISECOND] > 999
                  ? MILLISECOND
                  : -1;

          if (
              getParsingFlags(m)._overflowDayOfYear &&
              (overflow < YEAR || overflow > DATE)
          ) {
              overflow = DATE;
          }
          if (getParsingFlags(m)._overflowWeeks && overflow === -1) {
              overflow = WEEK;
          }
          if (getParsingFlags(m)._overflowWeekday && overflow === -1) {
              overflow = WEEKDAY;
          }

          getParsingFlags(m).overflow = overflow;
      }

      return m;
  }

  // iso 8601 regex
  // 0000-00-00 0000-W00 or 0000-W00-0 + T + 00 or 00:00 or 00:00:00 or 00:00:00.000 + +00:00 or +0000 or +00)
  var extendedIsoRegex =
          /^\s*((?:[+-]\d{6}|\d{4})-(?:\d\d-\d\d|W\d\d-\d|W\d\d|\d\d\d|\d\d))(?:(T| )(\d\d(?::\d\d(?::\d\d(?:[.,]\d+)?)?)?)([+-]\d\d(?::?\d\d)?|\s*Z)?)?$/,
      basicIsoRegex =
          /^\s*((?:[+-]\d{6}|\d{4})(?:\d\d\d\d|W\d\d\d|W\d\d|\d\d\d|\d\d|))(?:(T| )(\d\d(?:\d\d(?:\d\d(?:[.,]\d+)?)?)?)([+-]\d\d(?::?\d\d)?|\s*Z)?)?$/,
      tzRegex = /Z|[+-]\d\d(?::?\d\d)?/,
      isoDates = [
          ['YYYYYY-MM-DD', /[+-]\d{6}-\d\d-\d\d/],
          ['YYYY-MM-DD', /\d{4}-\d\d-\d\d/],
          ['GGGG-[W]WW-E', /\d{4}-W\d\d-\d/],
          ['GGGG-[W]WW', /\d{4}-W\d\d/, false],
          ['YYYY-DDD', /\d{4}-\d{3}/],
          ['YYYY-MM', /\d{4}-\d\d/, false],
          ['YYYYYYMMDD', /[+-]\d{10}/],
          ['YYYYMMDD', /\d{8}/],
          ['GGGG[W]WWE', /\d{4}W\d{3}/],
          ['GGGG[W]WW', /\d{4}W\d{2}/, false],
          ['YYYYDDD', /\d{7}/],
          ['YYYYMM', /\d{6}/, false],
          ['YYYY', /\d{4}/, false],
      ],
      // iso time formats and regexes
      isoTimes = [
          ['HH:mm:ss.SSSS', /\d\d:\d\d:\d\d\.\d+/],
          ['HH:mm:ss,SSSS', /\d\d:\d\d:\d\d,\d+/],
          ['HH:mm:ss', /\d\d:\d\d:\d\d/],
          ['HH:mm', /\d\d:\d\d/],
          ['HHmmss.SSSS', /\d\d\d\d\d\d\.\d+/],
          ['HHmmss,SSSS', /\d\d\d\d\d\d,\d+/],
          ['HHmmss', /\d\d\d\d\d\d/],
          ['HHmm', /\d\d\d\d/],
          ['HH', /\d\d/],
      ],
      aspNetJsonRegex = /^\/?Date\((-?\d+)/i,
      // RFC 2822 regex: For details see https://tools.ietf.org/html/rfc2822#section-3.3
      rfc2822 =
          /^(?:(Mon|Tue|Wed|Thu|Fri|Sat|Sun),?\s)?(\d{1,2})\s(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s(\d{2,4})\s(\d\d):(\d\d)(?::(\d\d))?\s(?:(UT|GMT|[ECMP][SD]T)|([Zz])|([+-]\d{4}))$/,
      obsOffsets = {
          UT: 0,
          GMT: 0,
          EDT: -4 * 60,
          EST: -5 * 60,
          CDT: -5 * 60,
          CST: -6 * 60,
          MDT: -6 * 60,
          MST: -7 * 60,
          PDT: -7 * 60,
          PST: -8 * 60,
      };

  // date from iso format
  function configFromISO(config) {
      var i,
          l,
          string = config._i,
          match = extendedIsoRegex.exec(string) || basicIsoRegex.exec(string),
          allowTime,
          dateFormat,
          timeFormat,
          tzFormat,
          isoDatesLen = isoDates.length,
          isoTimesLen = isoTimes.length;

      if (match) {
          getParsingFlags(config).iso = true;
          for (i = 0, l = isoDatesLen; i < l; i++) {
              if (isoDates[i][1].exec(match[1])) {
                  dateFormat = isoDates[i][0];
                  allowTime = isoDates[i][2] !== false;
                  break;
              }
          }
          if (dateFormat == null) {
              config._isValid = false;
              return;
          }
          if (match[3]) {
              for (i = 0, l = isoTimesLen; i < l; i++) {
                  if (isoTimes[i][1].exec(match[3])) {
                      // match[2] should be 'T' or space
                      timeFormat = (match[2] || ' ') + isoTimes[i][0];
                      break;
                  }
              }
              if (timeFormat == null) {
                  config._isValid = false;
                  return;
              }
          }
          if (!allowTime && timeFormat != null) {
              config._isValid = false;
              return;
          }
          if (match[4]) {
              if (tzRegex.exec(match[4])) {
                  tzFormat = 'Z';
              } else {
                  config._isValid = false;
                  return;
              }
          }
          config._f = dateFormat + (timeFormat || '') + (tzFormat || '');
          configFromStringAndFormat(config);
      } else {
          config._isValid = false;
      }
  }

  function extractFromRFC2822Strings(
      yearStr,
      monthStr,
      dayStr,
      hourStr,
      minuteStr,
      secondStr
  ) {
      var result = [
          untruncateYear(yearStr),
          defaultLocaleMonthsShort.indexOf(monthStr),
          parseInt(dayStr, 10),
          parseInt(hourStr, 10),
          parseInt(minuteStr, 10),
      ];

      if (secondStr) {
          result.push(parseInt(secondStr, 10));
      }

      return result;
  }

  function untruncateYear(yearStr) {
      var year = parseInt(yearStr, 10);
      if (year <= 49) {
          return 2000 + year;
      } else if (year <= 999) {
          return 1900 + year;
      }
      return year;
  }

  function preprocessRFC2822(s) {
      // Remove comments and folding whitespace and replace multiple-spaces with a single space
      return s
          .replace(/\([^()]*\)|[\n\t]/g, ' ')
          .replace(/(\s\s+)/g, ' ')
          .replace(/^\s\s*/, '')
          .replace(/\s\s*$/, '');
  }

  function checkWeekday(weekdayStr, parsedInput, config) {
      if (weekdayStr) {
          // TODO: Replace the vanilla JS Date object with an independent day-of-week check.
          var weekdayProvided = defaultLocaleWeekdaysShort.indexOf(weekdayStr),
              weekdayActual = new Date(
                  parsedInput[0],
                  parsedInput[1],
                  parsedInput[2]
              ).getDay();
          if (weekdayProvided !== weekdayActual) {
              getParsingFlags(config).weekdayMismatch = true;
              config._isValid = false;
              return false;
          }
      }
      return true;
  }

  function calculateOffset(obsOffset, militaryOffset, numOffset) {
      if (obsOffset) {
          return obsOffsets[obsOffset];
      } else if (militaryOffset) {
          // the only allowed military tz is Z
          return 0;
      } else {
          var hm = parseInt(numOffset, 10),
              m = hm % 100,
              h = (hm - m) / 100;
          return h * 60 + m;
      }
  }

  // date and time from ref 2822 format
  function configFromRFC2822(config) {
      var match = rfc2822.exec(preprocessRFC2822(config._i)),
          parsedArray;
      if (match) {
          parsedArray = extractFromRFC2822Strings(
              match[4],
              match[3],
              match[2],
              match[5],
              match[6],
              match[7]
          );
          if (!checkWeekday(match[1], parsedArray, config)) {
              return;
          }

          config._a = parsedArray;
          config._tzm = calculateOffset(match[8], match[9], match[10]);

          config._d = createUTCDate.apply(null, config._a);
          config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm);

          getParsingFlags(config).rfc2822 = true;
      } else {
          config._isValid = false;
      }
  }

  // date from 1) ASP.NET, 2) ISO, 3) RFC 2822 formats, or 4) optional fallback if parsing isn't strict
  function configFromString(config) {
      var matched = aspNetJsonRegex.exec(config._i);
      if (matched !== null) {
          config._d = new Date(+matched[1]);
          return;
      }

      configFromISO(config);
      if (config._isValid === false) {
          delete config._isValid;
      } else {
          return;
      }

      configFromRFC2822(config);
      if (config._isValid === false) {
          delete config._isValid;
      } else {
          return;
      }

      if (config._strict) {
          config._isValid = false;
      } else {
          // Final attempt, use Input Fallback
          hooks.createFromInputFallback(config);
      }
  }

  hooks.createFromInputFallback = deprecate(
      'value provided is not in a recognized RFC2822 or ISO format. moment construction falls back to js Date(), ' +
          'which is not reliable across all browsers and versions. Non RFC2822/ISO date formats are ' +
          'discouraged. Please refer to http://momentjs.com/guides/#/warnings/js-date/ for more info.',
      function (config) {
          config._d = new Date(config._i + (config._useUTC ? ' UTC' : ''));
      }
  );

  // Pick the first defined of two or three arguments.
  function defaults(a, b, c) {
      if (a != null) {
          return a;
      }
      if (b != null) {
          return b;
      }
      return c;
  }

  function currentDateArray(config) {
      // hooks is actually the exported moment object
      var nowValue = new Date(hooks.now());
      if (config._useUTC) {
          return [
              nowValue.getUTCFullYear(),
              nowValue.getUTCMonth(),
              nowValue.getUTCDate(),
          ];
      }
      return [nowValue.getFullYear(), nowValue.getMonth(), nowValue.getDate()];
  }

  // convert an array to a date.
  // the array should mirror the parameters below
  // note: all values past the year are optional and will default to the lowest possible value.
  // [year, month, day , hour, minute, second, millisecond]
  function configFromArray(config) {
      var i,
          date,
          input = [],
          currentDate,
          expectedWeekday,
          yearToUse;

      if (config._d) {
          return;
      }

      currentDate = currentDateArray(config);

      //compute day of the year from weeks and weekdays
      if (config._w && config._a[DATE] == null && config._a[MONTH] == null) {
          dayOfYearFromWeekInfo(config);
      }

      //if the day of the year is set, figure out what it is
      if (config._dayOfYear != null) {
          yearToUse = defaults(config._a[YEAR], currentDate[YEAR]);

          if (
              config._dayOfYear > daysInYear(yearToUse) ||
              config._dayOfYear === 0
          ) {
              getParsingFlags(config)._overflowDayOfYear = true;
          }

          date = createUTCDate(yearToUse, 0, config._dayOfYear);
          config._a[MONTH] = date.getUTCMonth();
          config._a[DATE] = date.getUTCDate();
      }

      // Default to current date.
      // * if no year, month, day of month are given, default to today
      // * if day of month is given, default month and year
      // * if month is given, default only year
      // * if year is given, don't default anything
      for (i = 0; i < 3 && config._a[i] == null; ++i) {
          config._a[i] = input[i] = currentDate[i];
      }

      // Zero out whatever was not defaulted, including time
      for (; i < 7; i++) {
          config._a[i] = input[i] =
              config._a[i] == null ? (i === 2 ? 1 : 0) : config._a[i];
      }

      // Check for 24:00:00.000
      if (
          config._a[HOUR] === 24 &&
          config._a[MINUTE] === 0 &&
          config._a[SECOND] === 0 &&
          config._a[MILLISECOND] === 0
      ) {
          config._nextDay = true;
          config._a[HOUR] = 0;
      }

      config._d = (config._useUTC ? createUTCDate : createDate).apply(
          null,
          input
      );
      expectedWeekday = config._useUTC
          ? config._d.getUTCDay()
          : config._d.getDay();

      // Apply timezone offset from input. The actual utcOffset can be changed
      // with parseZone.
      if (config._tzm != null) {
          config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm);
      }

      if (config._nextDay) {
          config._a[HOUR] = 24;
      }

      // check for mismatching day of week
      if (
          config._w &&
          typeof config._w.d !== 'undefined' &&
          config._w.d !== expectedWeekday
      ) {
          getParsingFlags(config).weekdayMismatch = true;
      }
  }

  function dayOfYearFromWeekInfo(config) {
      var w, weekYear, week, weekday, dow, doy, temp, weekdayOverflow, curWeek;

      w = config._w;
      if (w.GG != null || w.W != null || w.E != null) {
          dow = 1;
          doy = 4;

          // TODO: We need to take the current isoWeekYear, but that depends on
          // how we interpret now (local, utc, fixed offset). So create
          // a now version of current config (take local/utc/offset flags, and
          // create now).
          weekYear = defaults(
              w.GG,
              config._a[YEAR],
              weekOfYear(createLocal(), 1, 4).year
          );
          week = defaults(w.W, 1);
          weekday = defaults(w.E, 1);
          if (weekday < 1 || weekday > 7) {
              weekdayOverflow = true;
          }
      } else {
          dow = config._locale._week.dow;
          doy = config._locale._week.doy;

          curWeek = weekOfYear(createLocal(), dow, doy);

          weekYear = defaults(w.gg, config._a[YEAR], curWeek.year);

          // Default to current week.
          week = defaults(w.w, curWeek.week);

          if (w.d != null) {
              // weekday -- low day numbers are considered next week
              weekday = w.d;
              if (weekday < 0 || weekday > 6) {
                  weekdayOverflow = true;
              }
          } else if (w.e != null) {
              // local weekday -- counting starts from beginning of week
              weekday = w.e + dow;
              if (w.e < 0 || w.e > 6) {
                  weekdayOverflow = true;
              }
          } else {
              // default to beginning of week
              weekday = dow;
          }
      }
      if (week < 1 || week > weeksInYear(weekYear, dow, doy)) {
          getParsingFlags(config)._overflowWeeks = true;
      } else if (weekdayOverflow != null) {
          getParsingFlags(config)._overflowWeekday = true;
      } else {
          temp = dayOfYearFromWeeks(weekYear, week, weekday, dow, doy);
          config._a[YEAR] = temp.year;
          config._dayOfYear = temp.dayOfYear;
      }
  }

  // constant that refers to the ISO standard
  hooks.ISO_8601 = function () {};

  // constant that refers to the RFC 2822 form
  hooks.RFC_2822 = function () {};

  // date from string and format string
  function configFromStringAndFormat(config) {
      // TODO: Move this to another part of the creation flow to prevent circular deps
      if (config._f === hooks.ISO_8601) {
          configFromISO(config);
          return;
      }
      if (config._f === hooks.RFC_2822) {
          configFromRFC2822(config);
          return;
      }
      config._a = [];
      getParsingFlags(config).empty = true;

      // This array is used to make a Date, either with `new Date` or `Date.UTC`
      var string = '' + config._i,
          i,
          parsedInput,
          tokens,
          token,
          skipped,
          stringLength = string.length,
          totalParsedInputLength = 0,
          era,
          tokenLen;

      tokens =
          expandFormat(config._f, config._locale).match(formattingTokens) || [];
      tokenLen = tokens.length;
      for (i = 0; i < tokenLen; i++) {
          token = tokens[i];
          parsedInput = (string.match(getParseRegexForToken(token, config)) ||
              [])[0];
          if (parsedInput) {
              skipped = string.substr(0, string.indexOf(parsedInput));
              if (skipped.length > 0) {
                  getParsingFlags(config).unusedInput.push(skipped);
              }
              string = string.slice(
                  string.indexOf(parsedInput) + parsedInput.length
              );
              totalParsedInputLength += parsedInput.length;
          }
          // don't parse if it's not a known token
          if (formatTokenFunctions[token]) {
              if (parsedInput) {
                  getParsingFlags(config).empty = false;
              } else {
                  getParsingFlags(config).unusedTokens.push(token);
              }
              addTimeToArrayFromToken(token, parsedInput, config);
          } else if (config._strict && !parsedInput) {
              getParsingFlags(config).unusedTokens.push(token);
          }
      }

      // add remaining unparsed input length to the string
      getParsingFlags(config).charsLeftOver =
          stringLength - totalParsedInputLength;
      if (string.length > 0) {
          getParsingFlags(config).unusedInput.push(string);
      }

      // clear _12h flag if hour is <= 12
      if (
          config._a[HOUR] <= 12 &&
          getParsingFlags(config).bigHour === true &&
          config._a[HOUR] > 0
      ) {
          getParsingFlags(config).bigHour = undefined;
      }

      getParsingFlags(config).parsedDateParts = config._a.slice(0);
      getParsingFlags(config).meridiem = config._meridiem;
      // handle meridiem
      config._a[HOUR] = meridiemFixWrap(
          config._locale,
          config._a[HOUR],
          config._meridiem
      );

      // handle era
      era = getParsingFlags(config).era;
      if (era !== null) {
          config._a[YEAR] = config._locale.erasConvertYear(era, config._a[YEAR]);
      }

      configFromArray(config);
      checkOverflow(config);
  }

  function meridiemFixWrap(locale, hour, meridiem) {
      var isPm;

      if (meridiem == null) {
          // nothing to do
          return hour;
      }
      if (locale.meridiemHour != null) {
          return locale.meridiemHour(hour, meridiem);
      } else if (locale.isPM != null) {
          // Fallback
          isPm = locale.isPM(meridiem);
          if (isPm && hour < 12) {
              hour += 12;
          }
          if (!isPm && hour === 12) {
              hour = 0;
          }
          return hour;
      } else {
          // this is not supposed to happen
          return hour;
      }
  }

  // date from string and array of format strings
  function configFromStringAndArray(config) {
      var tempConfig,
          bestMoment,
          scoreToBeat,
          i,
          currentScore,
          validFormatFound,
          bestFormatIsValid = false,
          configfLen = config._f.length;

      if (configfLen === 0) {
          getParsingFlags(config).invalidFormat = true;
          config._d = new Date(NaN);
          return;
      }

      for (i = 0; i < configfLen; i++) {
          currentScore = 0;
          validFormatFound = false;
          tempConfig = copyConfig({}, config);
          if (config._useUTC != null) {
              tempConfig._useUTC = config._useUTC;
          }
          tempConfig._f = config._f[i];
          configFromStringAndFormat(tempConfig);

          if (isValid(tempConfig)) {
              validFormatFound = true;
          }

          // if there is any input that was not parsed add a penalty for that format
          currentScore += getParsingFlags(tempConfig).charsLeftOver;

          //or tokens
          currentScore += getParsingFlags(tempConfig).unusedTokens.length * 10;

          getParsingFlags(tempConfig).score = currentScore;

          if (!bestFormatIsValid) {
              if (
                  scoreToBeat == null ||
                  currentScore < scoreToBeat ||
                  validFormatFound
              ) {
                  scoreToBeat = currentScore;
                  bestMoment = tempConfig;
                  if (validFormatFound) {
                      bestFormatIsValid = true;
                  }
              }
          } else {
              if (currentScore < scoreToBeat) {
                  scoreToBeat = currentScore;
                  bestMoment = tempConfig;
              }
          }
      }

      extend(config, bestMoment || tempConfig);
  }

  function configFromObject(config) {
      if (config._d) {
          return;
      }

      var i = normalizeObjectUnits(config._i),
          dayOrDate = i.day === undefined ? i.date : i.day;
      config._a = map(
          [i.year, i.month, dayOrDate, i.hour, i.minute, i.second, i.millisecond],
          function (obj) {
              return obj && parseInt(obj, 10);
          }
      );

      configFromArray(config);
  }

  function createFromConfig(config) {
      var res = new Moment(checkOverflow(prepareConfig(config)));
      if (res._nextDay) {
          // Adding is smart enough around DST
          res.add(1, 'd');
          res._nextDay = undefined;
      }

      return res;
  }

  function prepareConfig(config) {
      var input = config._i,
          format = config._f;

      config._locale = config._locale || getLocale(config._l);

      if (input === null || (format === undefined && input === '')) {
          return createInvalid({ nullInput: true });
      }

      if (typeof input === 'string') {
          config._i = input = config._locale.preparse(input);
      }

      if (isMoment(input)) {
          return new Moment(checkOverflow(input));
      } else if (isDate(input)) {
          config._d = input;
      } else if (isArray(format)) {
          configFromStringAndArray(config);
      } else if (format) {
          configFromStringAndFormat(config);
      } else {
          configFromInput(config);
      }

      if (!isValid(config)) {
          config._d = null;
      }

      return config;
  }

  function configFromInput(config) {
      var input = config._i;
      if (isUndefined(input)) {
          config._d = new Date(hooks.now());
      } else if (isDate(input)) {
          config._d = new Date(input.valueOf());
      } else if (typeof input === 'string') {
          configFromString(config);
      } else if (isArray(input)) {
          config._a = map(input.slice(0), function (obj) {
              return parseInt(obj, 10);
          });
          configFromArray(config);
      } else if (isObject(input)) {
          configFromObject(config);
      } else if (isNumber(input)) {
          // from milliseconds
          config._d = new Date(input);
      } else {
          hooks.createFromInputFallback(config);
      }
  }

  function createLocalOrUTC(input, format, locale, strict, isUTC) {
      var c = {};

      if (format === true || format === false) {
          strict = format;
          format = undefined;
      }

      if (locale === true || locale === false) {
          strict = locale;
          locale = undefined;
      }

      if (
          (isObject(input) && isObjectEmpty(input)) ||
          (isArray(input) && input.length === 0)
      ) {
          input = undefined;
      }
      // object construction must be done this way.
      // https://github.com/moment/moment/issues/1423
      c._isAMomentObject = true;
      c._useUTC = c._isUTC = isUTC;
      c._l = locale;
      c._i = input;
      c._f = format;
      c._strict = strict;

      return createFromConfig(c);
  }

  function createLocal(input, format, locale, strict) {
      return createLocalOrUTC(input, format, locale, strict, false);
  }

  var prototypeMin = deprecate(
          'moment().min is deprecated, use moment.max instead. http://momentjs.com/guides/#/warnings/min-max/',
          function () {
              var other = createLocal.apply(null, arguments);
              if (this.isValid() && other.isValid()) {
                  return other < this ? this : other;
              } else {
                  return createInvalid();
              }
          }
      ),
      prototypeMax = deprecate(
          'moment().max is deprecated, use moment.min instead. http://momentjs.com/guides/#/warnings/min-max/',
          function () {
              var other = createLocal.apply(null, arguments);
              if (this.isValid() && other.isValid()) {
                  return other > this ? this : other;
              } else {
                  return createInvalid();
              }
          }
      );

  // Pick a moment m from moments so that m[fn](other) is true for all
  // other. This relies on the function fn to be transitive.
  //
  // moments should either be an array of moment objects or an array, whose
  // first element is an array of moment objects.
  function pickBy(fn, moments) {
      var res, i;
      if (moments.length === 1 && isArray(moments[0])) {
          moments = moments[0];
      }
      if (!moments.length) {
          return createLocal();
      }
      res = moments[0];
      for (i = 1; i < moments.length; ++i) {
          if (!moments[i].isValid() || moments[i][fn](res)) {
              res = moments[i];
          }
      }
      return res;
  }

  // TODO: Use [].sort instead?
  function min() {
      var args = [].slice.call(arguments, 0);

      return pickBy('isBefore', args);
  }

  function max() {
      var args = [].slice.call(arguments, 0);

      return pickBy('isAfter', args);
  }

  var now = function () {
      return Date.now ? Date.now() : +new Date();
  };

  var ordering = [
      'year',
      'quarter',
      'month',
      'week',
      'day',
      'hour',
      'minute',
      'second',
      'millisecond',
  ];

  function isDurationValid(m) {
      var key,
          unitHasDecimal = false,
          i,
          orderLen = ordering.length;
      for (key in m) {
          if (
              hasOwnProp(m, key) &&
              !(
                  indexOf.call(ordering, key) !== -1 &&
                  (m[key] == null || !isNaN(m[key]))
              )
          ) {
              return false;
          }
      }

      for (i = 0; i < orderLen; ++i) {
          if (m[ordering[i]]) {
              if (unitHasDecimal) {
                  return false; // only allow non-integers for smallest unit
              }
              if (parseFloat(m[ordering[i]]) !== toInt(m[ordering[i]])) {
                  unitHasDecimal = true;
              }
          }
      }

      return true;
  }

  function isValid$1() {
      return this._isValid;
  }

  function createInvalid$1() {
      return createDuration(NaN);
  }

  function Duration(duration) {
      var normalizedInput = normalizeObjectUnits(duration),
          years = normalizedInput.year || 0,
          quarters = normalizedInput.quarter || 0,
          months = normalizedInput.month || 0,
          weeks = normalizedInput.week || normalizedInput.isoWeek || 0,
          days = normalizedInput.day || 0,
          hours = normalizedInput.hour || 0,
          minutes = normalizedInput.minute || 0,
          seconds = normalizedInput.second || 0,
          milliseconds = normalizedInput.millisecond || 0;

      this._isValid = isDurationValid(normalizedInput);

      // representation for dateAddRemove
      this._milliseconds =
          +milliseconds +
          seconds * 1e3 + // 1000
          minutes * 6e4 + // 1000 * 60
          hours * 1000 * 60 * 60; //using 1000 * 60 * 60 instead of 36e5 to avoid floating point rounding errors https://github.com/moment/moment/issues/2978
      // Because of dateAddRemove treats 24 hours as different from a
      // day when working around DST, we need to store them separately
      this._days = +days + weeks * 7;
      // It is impossible to translate months into days without knowing
      // which months you are are talking about, so we have to store
      // it separately.
      this._months = +months + quarters * 3 + years * 12;

      this._data = {};

      this._locale = getLocale();

      this._bubble();
  }

  function isDuration(obj) {
      return obj instanceof Duration;
  }

  function absRound(number) {
      if (number < 0) {
          return Math.round(-1 * number) * -1;
      } else {
          return Math.round(number);
      }
  }

  // compare two arrays, return the number of differences
  function compareArrays(array1, array2, dontConvert) {
      var len = Math.min(array1.length, array2.length),
          lengthDiff = Math.abs(array1.length - array2.length),
          diffs = 0,
          i;
      for (i = 0; i < len; i++) {
          if (
              (dontConvert && array1[i] !== array2[i]) ||
              (!dontConvert && toInt(array1[i]) !== toInt(array2[i]))
          ) {
              diffs++;
          }
      }
      return diffs + lengthDiff;
  }

  // FORMATTING

  function offset(token, separator) {
      addFormatToken(token, 0, 0, function () {
          var offset = this.utcOffset(),
              sign = '+';
          if (offset < 0) {
              offset = -offset;
              sign = '-';
          }
          return (
              sign +
              zeroFill(~~(offset / 60), 2) +
              separator +
              zeroFill(~~offset % 60, 2)
          );
      });
  }

  offset('Z', ':');
  offset('ZZ', '');

  // PARSING

  addRegexToken('Z', matchShortOffset);
  addRegexToken('ZZ', matchShortOffset);
  addParseToken(['Z', 'ZZ'], function (input, array, config) {
      config._useUTC = true;
      config._tzm = offsetFromString(matchShortOffset, input);
  });

  // HELPERS

  // timezone chunker
  // '+10:00' > ['10',  '00']
  // '-1530'  > ['-15', '30']
  var chunkOffset = /([\+\-]|\d\d)/gi;

  function offsetFromString(matcher, string) {
      var matches = (string || '').match(matcher),
          chunk,
          parts,
          minutes;

      if (matches === null) {
          return null;
      }

      chunk = matches[matches.length - 1] || [];
      parts = (chunk + '').match(chunkOffset) || ['-', 0, 0];
      minutes = +(parts[1] * 60) + toInt(parts[2]);

      return minutes === 0 ? 0 : parts[0] === '+' ? minutes : -minutes;
  }

  // Return a moment from input, that is local/utc/zone equivalent to model.
  function cloneWithOffset(input, model) {
      var res, diff;
      if (model._isUTC) {
          res = model.clone();
          diff =
              (isMoment(input) || isDate(input)
                  ? input.valueOf()
                  : createLocal(input).valueOf()) - res.valueOf();
          // Use low-level api, because this fn is low-level api.
          res._d.setTime(res._d.valueOf() + diff);
          hooks.updateOffset(res, false);
          return res;
      } else {
          return createLocal(input).local();
      }
  }

  function getDateOffset(m) {
      // On Firefox.24 Date#getTimezoneOffset returns a floating point.
      // https://github.com/moment/moment/pull/1871
      return -Math.round(m._d.getTimezoneOffset());
  }

  // HOOKS

  // This function will be called whenever a moment is mutated.
  // It is intended to keep the offset in sync with the timezone.
  hooks.updateOffset = function () {};

  // MOMENTS

  // keepLocalTime = true means only change the timezone, without
  // affecting the local hour. So 5:31:26 +0300 --[utcOffset(2, true)]-->
  // 5:31:26 +0200 It is possible that 5:31:26 doesn't exist with offset
  // +0200, so we adjust the time as needed, to be valid.
  //
  // Keeping the time actually adds/subtracts (one hour)
  // from the actual represented time. That is why we call updateOffset
  // a second time. In case it wants us to change the offset again
  // _changeInProgress == true case, then we have to adjust, because
  // there is no such time in the given timezone.
  function getSetOffset(input, keepLocalTime, keepMinutes) {
      var offset = this._offset || 0,
          localAdjust;
      if (!this.isValid()) {
          return input != null ? this : NaN;
      }
      if (input != null) {
          if (typeof input === 'string') {
              input = offsetFromString(matchShortOffset, input);
              if (input === null) {
                  return this;
              }
          } else if (Math.abs(input) < 16 && !keepMinutes) {
              input = input * 60;
          }
          if (!this._isUTC && keepLocalTime) {
              localAdjust = getDateOffset(this);
          }
          this._offset = input;
          this._isUTC = true;
          if (localAdjust != null) {
              this.add(localAdjust, 'm');
          }
          if (offset !== input) {
              if (!keepLocalTime || this._changeInProgress) {
                  addSubtract(
                      this,
                      createDuration(input - offset, 'm'),
                      1,
                      false
                  );
              } else if (!this._changeInProgress) {
                  this._changeInProgress = true;
                  hooks.updateOffset(this, true);
                  this._changeInProgress = null;
              }
          }
          return this;
      } else {
          return this._isUTC ? offset : getDateOffset(this);
      }
  }

  function getSetZone(input, keepLocalTime) {
      if (input != null) {
          if (typeof input !== 'string') {
              input = -input;
          }

          this.utcOffset(input, keepLocalTime);

          return this;
      } else {
          return -this.utcOffset();
      }
  }

  function setOffsetToUTC(keepLocalTime) {
      return this.utcOffset(0, keepLocalTime);
  }

  function setOffsetToLocal(keepLocalTime) {
      if (this._isUTC) {
          this.utcOffset(0, keepLocalTime);
          this._isUTC = false;

          if (keepLocalTime) {
              this.subtract(getDateOffset(this), 'm');
          }
      }
      return this;
  }

  function setOffsetToParsedOffset() {
      if (this._tzm != null) {
          this.utcOffset(this._tzm, false, true);
      } else if (typeof this._i === 'string') {
          var tZone = offsetFromString(matchOffset, this._i);
          if (tZone != null) {
              this.utcOffset(tZone);
          } else {
              this.utcOffset(0, true);
          }
      }
      return this;
  }

  function hasAlignedHourOffset(input) {
      if (!this.isValid()) {
          return false;
      }
      input = input ? createLocal(input).utcOffset() : 0;

      return (this.utcOffset() - input) % 60 === 0;
  }

  function isDaylightSavingTime() {
      return (
          this.utcOffset() > this.clone().month(0).utcOffset() ||
          this.utcOffset() > this.clone().month(5).utcOffset()
      );
  }

  function isDaylightSavingTimeShifted() {
      if (!isUndefined(this._isDSTShifted)) {
          return this._isDSTShifted;
      }

      var c = {},
          other;

      copyConfig(c, this);
      c = prepareConfig(c);

      if (c._a) {
          other = c._isUTC ? createUTC(c._a) : createLocal(c._a);
          this._isDSTShifted =
              this.isValid() && compareArrays(c._a, other.toArray()) > 0;
      } else {
          this._isDSTShifted = false;
      }

      return this._isDSTShifted;
  }

  function isLocal() {
      return this.isValid() ? !this._isUTC : false;
  }

  function isUtcOffset() {
      return this.isValid() ? this._isUTC : false;
  }

  function isUtc() {
      return this.isValid() ? this._isUTC && this._offset === 0 : false;
  }

  // ASP.NET json date format regex
  var aspNetRegex = /^(-|\+)?(?:(\d*)[. ])?(\d+):(\d+)(?::(\d+)(\.\d*)?)?$/,
      // from http://docs.closure-library.googlecode.com/git/closure_goog_date_date.js.source.html
      // somewhat more in line with 4.4.3.2 2004 spec, but allows decimal anywhere
      // and further modified to allow for strings containing both week and day
      isoRegex =
          /^(-|\+)?P(?:([-+]?[0-9,.]*)Y)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)W)?(?:([-+]?[0-9,.]*)D)?(?:T(?:([-+]?[0-9,.]*)H)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)S)?)?$/;

  function createDuration(input, key) {
      var duration = input,
          // matching against regexp is expensive, do it on demand
          match = null,
          sign,
          ret,
          diffRes;

      if (isDuration(input)) {
          duration = {
              ms: input._milliseconds,
              d: input._days,
              M: input._months,
          };
      } else if (isNumber(input) || !isNaN(+input)) {
          duration = {};
          if (key) {
              duration[key] = +input;
          } else {
              duration.milliseconds = +input;
          }
      } else if ((match = aspNetRegex.exec(input))) {
          sign = match[1] === '-' ? -1 : 1;
          duration = {
              y: 0,
              d: toInt(match[DATE]) * sign,
              h: toInt(match[HOUR]) * sign,
              m: toInt(match[MINUTE]) * sign,
              s: toInt(match[SECOND]) * sign,
              ms: toInt(absRound(match[MILLISECOND] * 1000)) * sign, // the millisecond decimal point is included in the match
          };
      } else if ((match = isoRegex.exec(input))) {
          sign = match[1] === '-' ? -1 : 1;
          duration = {
              y: parseIso(match[2], sign),
              M: parseIso(match[3], sign),
              w: parseIso(match[4], sign),
              d: parseIso(match[5], sign),
              h: parseIso(match[6], sign),
              m: parseIso(match[7], sign),
              s: parseIso(match[8], sign),
          };
      } else if (duration == null) {
          // checks for null or undefined
          duration = {};
      } else if (
          typeof duration === 'object' &&
          ('from' in duration || 'to' in duration)
      ) {
          diffRes = momentsDifference(
              createLocal(duration.from),
              createLocal(duration.to)
          );

          duration = {};
          duration.ms = diffRes.milliseconds;
          duration.M = diffRes.months;
      }

      ret = new Duration(duration);

      if (isDuration(input) && hasOwnProp(input, '_locale')) {
          ret._locale = input._locale;
      }

      if (isDuration(input) && hasOwnProp(input, '_isValid')) {
          ret._isValid = input._isValid;
      }

      return ret;
  }

  createDuration.fn = Duration.prototype;
  createDuration.invalid = createInvalid$1;

  function parseIso(inp, sign) {
      // We'd normally use ~~inp for this, but unfortunately it also
      // converts floats to ints.
      // inp may be undefined, so careful calling replace on it.
      var res = inp && parseFloat(inp.replace(',', '.'));
      // apply sign while we're at it
      return (isNaN(res) ? 0 : res) * sign;
  }

  function positiveMomentsDifference(base, other) {
      var res = {};

      res.months =
          other.month() - base.month() + (other.year() - base.year()) * 12;
      if (base.clone().add(res.months, 'M').isAfter(other)) {
          --res.months;
      }

      res.milliseconds = +other - +base.clone().add(res.months, 'M');

      return res;
  }

  function momentsDifference(base, other) {
      var res;
      if (!(base.isValid() && other.isValid())) {
          return { milliseconds: 0, months: 0 };
      }

      other = cloneWithOffset(other, base);
      if (base.isBefore(other)) {
          res = positiveMomentsDifference(base, other);
      } else {
          res = positiveMomentsDifference(other, base);
          res.milliseconds = -res.milliseconds;
          res.months = -res.months;
      }

      return res;
  }

  // TODO: remove 'name' arg after deprecation is removed
  function createAdder(direction, name) {
      return function (val, period) {
          var dur, tmp;
          //invert the arguments, but complain about it
          if (period !== null && !isNaN(+period)) {
              deprecateSimple(
                  name,
                  'moment().' +
                      name +
                      '(period, number) is deprecated. Please use moment().' +
                      name +
                      '(number, period). ' +
                      'See http://momentjs.com/guides/#/warnings/add-inverted-param/ for more info.'
              );
              tmp = val;
              val = period;
              period = tmp;
          }

          dur = createDuration(val, period);
          addSubtract(this, dur, direction);
          return this;
      };
  }

  function addSubtract(mom, duration, isAdding, updateOffset) {
      var milliseconds = duration._milliseconds,
          days = absRound(duration._days),
          months = absRound(duration._months);

      if (!mom.isValid()) {
          // No op
          return;
      }

      updateOffset = updateOffset == null ? true : updateOffset;

      if (months) {
          setMonth(mom, get(mom, 'Month') + months * isAdding);
      }
      if (days) {
          set$1(mom, 'Date', get(mom, 'Date') + days * isAdding);
      }
      if (milliseconds) {
          mom._d.setTime(mom._d.valueOf() + milliseconds * isAdding);
      }
      if (updateOffset) {
          hooks.updateOffset(mom, days || months);
      }
  }

  var add = createAdder(1, 'add'),
      subtract = createAdder(-1, 'subtract');

  function isString(input) {
      return typeof input === 'string' || input instanceof String;
  }

  // type MomentInput = Moment | Date | string | number | (number | string)[] | MomentInputObject | void; // null | undefined
  function isMomentInput(input) {
      return (
          isMoment(input) ||
          isDate(input) ||
          isString(input) ||
          isNumber(input) ||
          isNumberOrStringArray(input) ||
          isMomentInputObject(input) ||
          input === null ||
          input === undefined
      );
  }

  function isMomentInputObject(input) {
      var objectTest = isObject(input) && !isObjectEmpty(input),
          propertyTest = false,
          properties = [
              'years',
              'year',
              'y',
              'months',
              'month',
              'M',
              'days',
              'day',
              'd',
              'dates',
              'date',
              'D',
              'hours',
              'hour',
              'h',
              'minutes',
              'minute',
              'm',
              'seconds',
              'second',
              's',
              'milliseconds',
              'millisecond',
              'ms',
          ],
          i,
          property,
          propertyLen = properties.length;

      for (i = 0; i < propertyLen; i += 1) {
          property = properties[i];
          propertyTest = propertyTest || hasOwnProp(input, property);
      }

      return objectTest && propertyTest;
  }

  function isNumberOrStringArray(input) {
      var arrayTest = isArray(input),
          dataTypeTest = false;
      if (arrayTest) {
          dataTypeTest =
              input.filter(function (item) {
                  return !isNumber(item) && isString(input);
              }).length === 0;
      }
      return arrayTest && dataTypeTest;
  }

  function isCalendarSpec(input) {
      var objectTest = isObject(input) && !isObjectEmpty(input),
          propertyTest = false,
          properties = [
              'sameDay',
              'nextDay',
              'lastDay',
              'nextWeek',
              'lastWeek',
              'sameElse',
          ],
          i,
          property;

      for (i = 0; i < properties.length; i += 1) {
          property = properties[i];
          propertyTest = propertyTest || hasOwnProp(input, property);
      }

      return objectTest && propertyTest;
  }

  function getCalendarFormat(myMoment, now) {
      var diff = myMoment.diff(now, 'days', true);
      return diff < -6
          ? 'sameElse'
          : diff < -1
          ? 'lastWeek'
          : diff < 0
          ? 'lastDay'
          : diff < 1
          ? 'sameDay'
          : diff < 2
          ? 'nextDay'
          : diff < 7
          ? 'nextWeek'
          : 'sameElse';
  }

  function calendar$1(time, formats) {
      // Support for single parameter, formats only overload to the calendar function
      if (arguments.length === 1) {
          if (!arguments[0]) {
              time = undefined;
              formats = undefined;
          } else if (isMomentInput(arguments[0])) {
              time = arguments[0];
              formats = undefined;
          } else if (isCalendarSpec(arguments[0])) {
              formats = arguments[0];
              time = undefined;
          }
      }
      // We want to compare the start of today, vs this.
      // Getting start-of-today depends on whether we're local/utc/offset or not.
      var now = time || createLocal(),
          sod = cloneWithOffset(now, this).startOf('day'),
          format = hooks.calendarFormat(this, sod) || 'sameElse',
          output =
              formats &&
              (isFunction(formats[format])
                  ? formats[format].call(this, now)
                  : formats[format]);

      return this.format(
          output || this.localeData().calendar(format, this, createLocal(now))
      );
  }

  function clone() {
      return new Moment(this);
  }

  function isAfter(input, units) {
      var localInput = isMoment(input) ? input : createLocal(input);
      if (!(this.isValid() && localInput.isValid())) {
          return false;
      }
      units = normalizeUnits(units) || 'millisecond';
      if (units === 'millisecond') {
          return this.valueOf() > localInput.valueOf();
      } else {
          return localInput.valueOf() < this.clone().startOf(units).valueOf();
      }
  }

  function isBefore(input, units) {
      var localInput = isMoment(input) ? input : createLocal(input);
      if (!(this.isValid() && localInput.isValid())) {
          return false;
      }
      units = normalizeUnits(units) || 'millisecond';
      if (units === 'millisecond') {
          return this.valueOf() < localInput.valueOf();
      } else {
          return this.clone().endOf(units).valueOf() < localInput.valueOf();
      }
  }

  function isBetween(from, to, units, inclusivity) {
      var localFrom = isMoment(from) ? from : createLocal(from),
          localTo = isMoment(to) ? to : createLocal(to);
      if (!(this.isValid() && localFrom.isValid() && localTo.isValid())) {
          return false;
      }
      inclusivity = inclusivity || '()';
      return (
          (inclusivity[0] === '('
              ? this.isAfter(localFrom, units)
              : !this.isBefore(localFrom, units)) &&
          (inclusivity[1] === ')'
              ? this.isBefore(localTo, units)
              : !this.isAfter(localTo, units))
      );
  }

  function isSame(input, units) {
      var localInput = isMoment(input) ? input : createLocal(input),
          inputMs;
      if (!(this.isValid() && localInput.isValid())) {
          return false;
      }
      units = normalizeUnits(units) || 'millisecond';
      if (units === 'millisecond') {
          return this.valueOf() === localInput.valueOf();
      } else {
          inputMs = localInput.valueOf();
          return (
              this.clone().startOf(units).valueOf() <= inputMs &&
              inputMs <= this.clone().endOf(units).valueOf()
          );
      }
  }

  function isSameOrAfter(input, units) {
      return this.isSame(input, units) || this.isAfter(input, units);
  }

  function isSameOrBefore(input, units) {
      return this.isSame(input, units) || this.isBefore(input, units);
  }

  function diff(input, units, asFloat) {
      var that, zoneDelta, output;

      if (!this.isValid()) {
          return NaN;
      }

      that = cloneWithOffset(input, this);

      if (!that.isValid()) {
          return NaN;
      }

      zoneDelta = (that.utcOffset() - this.utcOffset()) * 6e4;

      units = normalizeUnits(units);

      switch (units) {
          case 'year':
              output = monthDiff(this, that) / 12;
              break;
          case 'month':
              output = monthDiff(this, that);
              break;
          case 'quarter':
              output = monthDiff(this, that) / 3;
              break;
          case 'second':
              output = (this - that) / 1e3;
              break; // 1000
          case 'minute':
              output = (this - that) / 6e4;
              break; // 1000 * 60
          case 'hour':
              output = (this - that) / 36e5;
              break; // 1000 * 60 * 60
          case 'day':
              output = (this - that - zoneDelta) / 864e5;
              break; // 1000 * 60 * 60 * 24, negate dst
          case 'week':
              output = (this - that - zoneDelta) / 6048e5;
              break; // 1000 * 60 * 60 * 24 * 7, negate dst
          default:
              output = this - that;
      }

      return asFloat ? output : absFloor(output);
  }

  function monthDiff(a, b) {
      if (a.date() < b.date()) {
          // end-of-month calculations work correct when the start month has more
          // days than the end month.
          return -monthDiff(b, a);
      }
      // difference in months
      var wholeMonthDiff = (b.year() - a.year()) * 12 + (b.month() - a.month()),
          // b is in (anchor - 1 month, anchor + 1 month)
          anchor = a.clone().add(wholeMonthDiff, 'months'),
          anchor2,
          adjust;

      if (b - anchor < 0) {
          anchor2 = a.clone().add(wholeMonthDiff - 1, 'months');
          // linear across the month
          adjust = (b - anchor) / (anchor - anchor2);
      } else {
          anchor2 = a.clone().add(wholeMonthDiff + 1, 'months');
          // linear across the month
          adjust = (b - anchor) / (anchor2 - anchor);
      }

      //check for negative zero, return zero if negative zero
      return -(wholeMonthDiff + adjust) || 0;
  }

  hooks.defaultFormat = 'YYYY-MM-DDTHH:mm:ssZ';
  hooks.defaultFormatUtc = 'YYYY-MM-DDTHH:mm:ss[Z]';

  function toString() {
      return this.clone().locale('en').format('ddd MMM DD YYYY HH:mm:ss [GMT]ZZ');
  }

  function toISOString(keepOffset) {
      if (!this.isValid()) {
          return null;
      }
      var utc = keepOffset !== true,
          m = utc ? this.clone().utc() : this;
      if (m.year() < 0 || m.year() > 9999) {
          return formatMoment(
              m,
              utc
                  ? 'YYYYYY-MM-DD[T]HH:mm:ss.SSS[Z]'
                  : 'YYYYYY-MM-DD[T]HH:mm:ss.SSSZ'
          );
      }
      if (isFunction(Date.prototype.toISOString)) {
          // native implementation is ~50x faster, use it when we can
          if (utc) {
              return this.toDate().toISOString();
          } else {
              return new Date(this.valueOf() + this.utcOffset() * 60 * 1000)
                  .toISOString()
                  .replace('Z', formatMoment(m, 'Z'));
          }
      }
      return formatMoment(
          m,
          utc ? 'YYYY-MM-DD[T]HH:mm:ss.SSS[Z]' : 'YYYY-MM-DD[T]HH:mm:ss.SSSZ'
      );
  }

  /**
   * Return a human readable representation of a moment that can
   * also be evaluated to get a new moment which is the same
   *
   * @link https://nodejs.org/dist/latest/docs/api/util.html#util_custom_inspect_function_on_objects
   */
  function inspect() {
      if (!this.isValid()) {
          return 'moment.invalid(/* ' + this._i + ' */)';
      }
      var func = 'moment',
          zone = '',
          prefix,
          year,
          datetime,
          suffix;
      if (!this.isLocal()) {
          func = this.utcOffset() === 0 ? 'moment.utc' : 'moment.parseZone';
          zone = 'Z';
      }
      prefix = '[' + func + '("]';
      year = 0 <= this.year() && this.year() <= 9999 ? 'YYYY' : 'YYYYYY';
      datetime = '-MM-DD[T]HH:mm:ss.SSS';
      suffix = zone + '[")]';

      return this.format(prefix + year + datetime + suffix);
  }

  function format(inputString) {
      if (!inputString) {
          inputString = this.isUtc()
              ? hooks.defaultFormatUtc
              : hooks.defaultFormat;
      }
      var output = formatMoment(this, inputString);
      return this.localeData().postformat(output);
  }

  function from(time, withoutSuffix) {
      if (
          this.isValid() &&
          ((isMoment(time) && time.isValid()) || createLocal(time).isValid())
      ) {
          return createDuration({ to: this, from: time })
              .locale(this.locale())
              .humanize(!withoutSuffix);
      } else {
          return this.localeData().invalidDate();
      }
  }

  function fromNow(withoutSuffix) {
      return this.from(createLocal(), withoutSuffix);
  }

  function to(time, withoutSuffix) {
      if (
          this.isValid() &&
          ((isMoment(time) && time.isValid()) || createLocal(time).isValid())
      ) {
          return createDuration({ from: this, to: time })
              .locale(this.locale())
              .humanize(!withoutSuffix);
      } else {
          return this.localeData().invalidDate();
      }
  }

  function toNow(withoutSuffix) {
      return this.to(createLocal(), withoutSuffix);
  }

  // If passed a locale key, it will set the locale for this
  // instance.  Otherwise, it will return the locale configuration
  // variables for this instance.
  function locale(key) {
      var newLocaleData;

      if (key === undefined) {
          return this._locale._abbr;
      } else {
          newLocaleData = getLocale(key);
          if (newLocaleData != null) {
              this._locale = newLocaleData;
          }
          return this;
      }
  }

  var lang = deprecate(
      'moment().lang() is deprecated. Instead, use moment().localeData() to get the language configuration. Use moment().locale() to change languages.',
      function (key) {
          if (key === undefined) {
              return this.localeData();
          } else {
              return this.locale(key);
          }
      }
  );

  function localeData() {
      return this._locale;
  }

  var MS_PER_SECOND = 1000,
      MS_PER_MINUTE = 60 * MS_PER_SECOND,
      MS_PER_HOUR = 60 * MS_PER_MINUTE,
      MS_PER_400_YEARS = (365 * 400 + 97) * 24 * MS_PER_HOUR;

  // actual modulo - handles negative numbers (for dates before 1970):
  function mod$1(dividend, divisor) {
      return ((dividend % divisor) + divisor) % divisor;
  }

  function localStartOfDate(y, m, d) {
      // the date constructor remaps years 0-99 to 1900-1999
      if (y < 100 && y >= 0) {
          // preserve leap years using a full 400 year cycle, then reset
          return new Date(y + 400, m, d) - MS_PER_400_YEARS;
      } else {
          return new Date(y, m, d).valueOf();
      }
  }

  function utcStartOfDate(y, m, d) {
      // Date.UTC remaps years 0-99 to 1900-1999
      if (y < 100 && y >= 0) {
          // preserve leap years using a full 400 year cycle, then reset
          return Date.UTC(y + 400, m, d) - MS_PER_400_YEARS;
      } else {
          return Date.UTC(y, m, d);
      }
  }

  function startOf(units) {
      var time, startOfDate;
      units = normalizeUnits(units);
      if (units === undefined || units === 'millisecond' || !this.isValid()) {
          return this;
      }

      startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate;

      switch (units) {
          case 'year':
              time = startOfDate(this.year(), 0, 1);
              break;
          case 'quarter':
              time = startOfDate(
                  this.year(),
                  this.month() - (this.month() % 3),
                  1
              );
              break;
          case 'month':
              time = startOfDate(this.year(), this.month(), 1);
              break;
          case 'week':
              time = startOfDate(
                  this.year(),
                  this.month(),
                  this.date() - this.weekday()
              );
              break;
          case 'isoWeek':
              time = startOfDate(
                  this.year(),
                  this.month(),
                  this.date() - (this.isoWeekday() - 1)
              );
              break;
          case 'day':
          case 'date':
              time = startOfDate(this.year(), this.month(), this.date());
              break;
          case 'hour':
              time = this._d.valueOf();
              time -= mod$1(
                  time + (this._isUTC ? 0 : this.utcOffset() * MS_PER_MINUTE),
                  MS_PER_HOUR
              );
              break;
          case 'minute':
              time = this._d.valueOf();
              time -= mod$1(time, MS_PER_MINUTE);
              break;
          case 'second':
              time = this._d.valueOf();
              time -= mod$1(time, MS_PER_SECOND);
              break;
      }

      this._d.setTime(time);
      hooks.updateOffset(this, true);
      return this;
  }

  function endOf(units) {
      var time, startOfDate;
      units = normalizeUnits(units);
      if (units === undefined || units === 'millisecond' || !this.isValid()) {
          return this;
      }

      startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate;

      switch (units) {
          case 'year':
              time = startOfDate(this.year() + 1, 0, 1) - 1;
              break;
          case 'quarter':
              time =
                  startOfDate(
                      this.year(),
                      this.month() - (this.month() % 3) + 3,
                      1
                  ) - 1;
              break;
          case 'month':
              time = startOfDate(this.year(), this.month() + 1, 1) - 1;
              break;
          case 'week':
              time =
                  startOfDate(
                      this.year(),
                      this.month(),
                      this.date() - this.weekday() + 7
                  ) - 1;
              break;
          case 'isoWeek':
              time =
                  startOfDate(
                      this.year(),
                      this.month(),
                      this.date() - (this.isoWeekday() - 1) + 7
                  ) - 1;
              break;
          case 'day':
          case 'date':
              time = startOfDate(this.year(), this.month(), this.date() + 1) - 1;
              break;
          case 'hour':
              time = this._d.valueOf();
              time +=
                  MS_PER_HOUR -
                  mod$1(
                      time + (this._isUTC ? 0 : this.utcOffset() * MS_PER_MINUTE),
                      MS_PER_HOUR
                  ) -
                  1;
              break;
          case 'minute':
              time = this._d.valueOf();
              time += MS_PER_MINUTE - mod$1(time, MS_PER_MINUTE) - 1;
              break;
          case 'second':
              time = this._d.valueOf();
              time += MS_PER_SECOND - mod$1(time, MS_PER_SECOND) - 1;
              break;
      }

      this._d.setTime(time);
      hooks.updateOffset(this, true);
      return this;
  }

  function valueOf() {
      return this._d.valueOf() - (this._offset || 0) * 60000;
  }

  function unix() {
      return Math.floor(this.valueOf() / 1000);
  }

  function toDate() {
      return new Date(this.valueOf());
  }

  function toArray() {
      var m = this;
      return [
          m.year(),
          m.month(),
          m.date(),
          m.hour(),
          m.minute(),
          m.second(),
          m.millisecond(),
      ];
  }

  function toObject() {
      var m = this;
      return {
          years: m.year(),
          months: m.month(),
          date: m.date(),
          hours: m.hours(),
          minutes: m.minutes(),
          seconds: m.seconds(),
          milliseconds: m.milliseconds(),
      };
  }

  function toJSON() {
      // new Date(NaN).toJSON() === null
      return this.isValid() ? this.toISOString() : null;
  }

  function isValid$2() {
      return isValid(this);
  }

  function parsingFlags() {
      return extend({}, getParsingFlags(this));
  }

  function invalidAt() {
      return getParsingFlags(this).overflow;
  }

  function creationData() {
      return {
          input: this._i,
          format: this._f,
          locale: this._locale,
          isUTC: this._isUTC,
          strict: this._strict,
      };
  }

  addFormatToken('N', 0, 0, 'eraAbbr');
  addFormatToken('NN', 0, 0, 'eraAbbr');
  addFormatToken('NNN', 0, 0, 'eraAbbr');
  addFormatToken('NNNN', 0, 0, 'eraName');
  addFormatToken('NNNNN', 0, 0, 'eraNarrow');

  addFormatToken('y', ['y', 1], 'yo', 'eraYear');
  addFormatToken('y', ['yy', 2], 0, 'eraYear');
  addFormatToken('y', ['yyy', 3], 0, 'eraYear');
  addFormatToken('y', ['yyyy', 4], 0, 'eraYear');

  addRegexToken('N', matchEraAbbr);
  addRegexToken('NN', matchEraAbbr);
  addRegexToken('NNN', matchEraAbbr);
  addRegexToken('NNNN', matchEraName);
  addRegexToken('NNNNN', matchEraNarrow);

  addParseToken(
      ['N', 'NN', 'NNN', 'NNNN', 'NNNNN'],
      function (input, array, config, token) {
          var era = config._locale.erasParse(input, token, config._strict);
          if (era) {
              getParsingFlags(config).era = era;
          } else {
              getParsingFlags(config).invalidEra = input;
          }
      }
  );

  addRegexToken('y', matchUnsigned);
  addRegexToken('yy', matchUnsigned);
  addRegexToken('yyy', matchUnsigned);
  addRegexToken('yyyy', matchUnsigned);
  addRegexToken('yo', matchEraYearOrdinal);

  addParseToken(['y', 'yy', 'yyy', 'yyyy'], YEAR);
  addParseToken(['yo'], function (input, array, config, token) {
      var match;
      if (config._locale._eraYearOrdinalRegex) {
          match = input.match(config._locale._eraYearOrdinalRegex);
      }

      if (config._locale.eraYearOrdinalParse) {
          array[YEAR] = config._locale.eraYearOrdinalParse(input, match);
      } else {
          array[YEAR] = parseInt(input, 10);
      }
  });

  function localeEras(m, format) {
      var i,
          l,
          date,
          eras = this._eras || getLocale('en')._eras;
      for (i = 0, l = eras.length; i < l; ++i) {
          switch (typeof eras[i].since) {
              case 'string':
                  // truncate time
                  date = hooks(eras[i].since).startOf('day');
                  eras[i].since = date.valueOf();
                  break;
          }

          switch (typeof eras[i].until) {
              case 'undefined':
                  eras[i].until = +Infinity;
                  break;
              case 'string':
                  // truncate time
                  date = hooks(eras[i].until).startOf('day').valueOf();
                  eras[i].until = date.valueOf();
                  break;
          }
      }
      return eras;
  }

  function localeErasParse(eraName, format, strict) {
      var i,
          l,
          eras = this.eras(),
          name,
          abbr,
          narrow;
      eraName = eraName.toUpperCase();

      for (i = 0, l = eras.length; i < l; ++i) {
          name = eras[i].name.toUpperCase();
          abbr = eras[i].abbr.toUpperCase();
          narrow = eras[i].narrow.toUpperCase();

          if (strict) {
              switch (format) {
                  case 'N':
                  case 'NN':
                  case 'NNN':
                      if (abbr === eraName) {
                          return eras[i];
                      }
                      break;

                  case 'NNNN':
                      if (name === eraName) {
                          return eras[i];
                      }
                      break;

                  case 'NNNNN':
                      if (narrow === eraName) {
                          return eras[i];
                      }
                      break;
              }
          } else if ([name, abbr, narrow].indexOf(eraName) >= 0) {
              return eras[i];
          }
      }
  }

  function localeErasConvertYear(era, year) {
      var dir = era.since <= era.until ? +1 : -1;
      if (year === undefined) {
          return hooks(era.since).year();
      } else {
          return hooks(era.since).year() + (year - era.offset) * dir;
      }
  }

  function getEraName() {
      var i,
          l,
          val,
          eras = this.localeData().eras();
      for (i = 0, l = eras.length; i < l; ++i) {
          // truncate time
          val = this.clone().startOf('day').valueOf();

          if (eras[i].since <= val && val <= eras[i].until) {
              return eras[i].name;
          }
          if (eras[i].until <= val && val <= eras[i].since) {
              return eras[i].name;
          }
      }

      return '';
  }

  function getEraNarrow() {
      var i,
          l,
          val,
          eras = this.localeData().eras();
      for (i = 0, l = eras.length; i < l; ++i) {
          // truncate time
          val = this.clone().startOf('day').valueOf();

          if (eras[i].since <= val && val <= eras[i].until) {
              return eras[i].narrow;
          }
          if (eras[i].until <= val && val <= eras[i].since) {
              return eras[i].narrow;
          }
      }

      return '';
  }

  function getEraAbbr() {
      var i,
          l,
          val,
          eras = this.localeData().eras();
      for (i = 0, l = eras.length; i < l; ++i) {
          // truncate time
          val = this.clone().startOf('day').valueOf();

          if (eras[i].since <= val && val <= eras[i].until) {
              return eras[i].abbr;
          }
          if (eras[i].until <= val && val <= eras[i].since) {
              return eras[i].abbr;
          }
      }

      return '';
  }

  function getEraYear() {
      var i,
          l,
          dir,
          val,
          eras = this.localeData().eras();
      for (i = 0, l = eras.length; i < l; ++i) {
          dir = eras[i].since <= eras[i].until ? +1 : -1;

          // truncate time
          val = this.clone().startOf('day').valueOf();

          if (
              (eras[i].since <= val && val <= eras[i].until) ||
              (eras[i].until <= val && val <= eras[i].since)
          ) {
              return (
                  (this.year() - hooks(eras[i].since).year()) * dir +
                  eras[i].offset
              );
          }
      }

      return this.year();
  }

  function erasNameRegex(isStrict) {
      if (!hasOwnProp(this, '_erasNameRegex')) {
          computeErasParse.call(this);
      }
      return isStrict ? this._erasNameRegex : this._erasRegex;
  }

  function erasAbbrRegex(isStrict) {
      if (!hasOwnProp(this, '_erasAbbrRegex')) {
          computeErasParse.call(this);
      }
      return isStrict ? this._erasAbbrRegex : this._erasRegex;
  }

  function erasNarrowRegex(isStrict) {
      if (!hasOwnProp(this, '_erasNarrowRegex')) {
          computeErasParse.call(this);
      }
      return isStrict ? this._erasNarrowRegex : this._erasRegex;
  }

  function matchEraAbbr(isStrict, locale) {
      return locale.erasAbbrRegex(isStrict);
  }

  function matchEraName(isStrict, locale) {
      return locale.erasNameRegex(isStrict);
  }

  function matchEraNarrow(isStrict, locale) {
      return locale.erasNarrowRegex(isStrict);
  }

  function matchEraYearOrdinal(isStrict, locale) {
      return locale._eraYearOrdinalRegex || matchUnsigned;
  }

  function computeErasParse() {
      var abbrPieces = [],
          namePieces = [],
          narrowPieces = [],
          mixedPieces = [],
          i,
          l,
          eras = this.eras();

      for (i = 0, l = eras.length; i < l; ++i) {
          namePieces.push(regexEscape(eras[i].name));
          abbrPieces.push(regexEscape(eras[i].abbr));
          narrowPieces.push(regexEscape(eras[i].narrow));

          mixedPieces.push(regexEscape(eras[i].name));
          mixedPieces.push(regexEscape(eras[i].abbr));
          mixedPieces.push(regexEscape(eras[i].narrow));
      }

      this._erasRegex = new RegExp('^(' + mixedPieces.join('|') + ')', 'i');
      this._erasNameRegex = new RegExp('^(' + namePieces.join('|') + ')', 'i');
      this._erasAbbrRegex = new RegExp('^(' + abbrPieces.join('|') + ')', 'i');
      this._erasNarrowRegex = new RegExp(
          '^(' + narrowPieces.join('|') + ')',
          'i'
      );
  }

  // FORMATTING

  addFormatToken(0, ['gg', 2], 0, function () {
      return this.weekYear() % 100;
  });

  addFormatToken(0, ['GG', 2], 0, function () {
      return this.isoWeekYear() % 100;
  });

  function addWeekYearFormatToken(token, getter) {
      addFormatToken(0, [token, token.length], 0, getter);
  }

  addWeekYearFormatToken('gggg', 'weekYear');
  addWeekYearFormatToken('ggggg', 'weekYear');
  addWeekYearFormatToken('GGGG', 'isoWeekYear');
  addWeekYearFormatToken('GGGGG', 'isoWeekYear');

  // ALIASES

  addUnitAlias('weekYear', 'gg');
  addUnitAlias('isoWeekYear', 'GG');

  // PRIORITY

  addUnitPriority('weekYear', 1);
  addUnitPriority('isoWeekYear', 1);

  // PARSING

  addRegexToken('G', matchSigned);
  addRegexToken('g', matchSigned);
  addRegexToken('GG', match1to2, match2);
  addRegexToken('gg', match1to2, match2);
  addRegexToken('GGGG', match1to4, match4);
  addRegexToken('gggg', match1to4, match4);
  addRegexToken('GGGGG', match1to6, match6);
  addRegexToken('ggggg', match1to6, match6);

  addWeekParseToken(
      ['gggg', 'ggggg', 'GGGG', 'GGGGG'],
      function (input, week, config, token) {
          week[token.substr(0, 2)] = toInt(input);
      }
  );

  addWeekParseToken(['gg', 'GG'], function (input, week, config, token) {
      week[token] = hooks.parseTwoDigitYear(input);
  });

  // MOMENTS

  function getSetWeekYear(input) {
      return getSetWeekYearHelper.call(
          this,
          input,
          this.week(),
          this.weekday(),
          this.localeData()._week.dow,
          this.localeData()._week.doy
      );
  }

  function getSetISOWeekYear(input) {
      return getSetWeekYearHelper.call(
          this,
          input,
          this.isoWeek(),
          this.isoWeekday(),
          1,
          4
      );
  }

  function getISOWeeksInYear() {
      return weeksInYear(this.year(), 1, 4);
  }

  function getISOWeeksInISOWeekYear() {
      return weeksInYear(this.isoWeekYear(), 1, 4);
  }

  function getWeeksInYear() {
      var weekInfo = this.localeData()._week;
      return weeksInYear(this.year(), weekInfo.dow, weekInfo.doy);
  }

  function getWeeksInWeekYear() {
      var weekInfo = this.localeData()._week;
      return weeksInYear(this.weekYear(), weekInfo.dow, weekInfo.doy);
  }

  function getSetWeekYearHelper(input, week, weekday, dow, doy) {
      var weeksTarget;
      if (input == null) {
          return weekOfYear(this, dow, doy).year;
      } else {
          weeksTarget = weeksInYear(input, dow, doy);
          if (week > weeksTarget) {
              week = weeksTarget;
          }
          return setWeekAll.call(this, input, week, weekday, dow, doy);
      }
  }

  function setWeekAll(weekYear, week, weekday, dow, doy) {
      var dayOfYearData = dayOfYearFromWeeks(weekYear, week, weekday, dow, doy),
          date = createUTCDate(dayOfYearData.year, 0, dayOfYearData.dayOfYear);

      this.year(date.getUTCFullYear());
      this.month(date.getUTCMonth());
      this.date(date.getUTCDate());
      return this;
  }

  // FORMATTING

  addFormatToken('Q', 0, 'Qo', 'quarter');

  // ALIASES

  addUnitAlias('quarter', 'Q');

  // PRIORITY

  addUnitPriority('quarter', 7);

  // PARSING

  addRegexToken('Q', match1);
  addParseToken('Q', function (input, array) {
      array[MONTH] = (toInt(input) - 1) * 3;
  });

  // MOMENTS

  function getSetQuarter(input) {
      return input == null
          ? Math.ceil((this.month() + 1) / 3)
          : this.month((input - 1) * 3 + (this.month() % 3));
  }

  // FORMATTING

  addFormatToken('D', ['DD', 2], 'Do', 'date');

  // ALIASES

  addUnitAlias('date', 'D');

  // PRIORITY
  addUnitPriority('date', 9);

  // PARSING

  addRegexToken('D', match1to2);
  addRegexToken('DD', match1to2, match2);
  addRegexToken('Do', function (isStrict, locale) {
      // TODO: Remove "ordinalParse" fallback in next major release.
      return isStrict
          ? locale._dayOfMonthOrdinalParse || locale._ordinalParse
          : locale._dayOfMonthOrdinalParseLenient;
  });

  addParseToken(['D', 'DD'], DATE);
  addParseToken('Do', function (input, array) {
      array[DATE] = toInt(input.match(match1to2)[0]);
  });

  // MOMENTS

  var getSetDayOfMonth = makeGetSet('Date', true);

  // FORMATTING

  addFormatToken('DDD', ['DDDD', 3], 'DDDo', 'dayOfYear');

  // ALIASES

  addUnitAlias('dayOfYear', 'DDD');

  // PRIORITY
  addUnitPriority('dayOfYear', 4);

  // PARSING

  addRegexToken('DDD', match1to3);
  addRegexToken('DDDD', match3);
  addParseToken(['DDD', 'DDDD'], function (input, array, config) {
      config._dayOfYear = toInt(input);
  });

  // HELPERS

  // MOMENTS

  function getSetDayOfYear(input) {
      var dayOfYear =
          Math.round(
              (this.clone().startOf('day') - this.clone().startOf('year')) / 864e5
          ) + 1;
      return input == null ? dayOfYear : this.add(input - dayOfYear, 'd');
  }

  // FORMATTING

  addFormatToken('m', ['mm', 2], 0, 'minute');

  // ALIASES

  addUnitAlias('minute', 'm');

  // PRIORITY

  addUnitPriority('minute', 14);

  // PARSING

  addRegexToken('m', match1to2);
  addRegexToken('mm', match1to2, match2);
  addParseToken(['m', 'mm'], MINUTE);

  // MOMENTS

  var getSetMinute = makeGetSet('Minutes', false);

  // FORMATTING

  addFormatToken('s', ['ss', 2], 0, 'second');

  // ALIASES

  addUnitAlias('second', 's');

  // PRIORITY

  addUnitPriority('second', 15);

  // PARSING

  addRegexToken('s', match1to2);
  addRegexToken('ss', match1to2, match2);
  addParseToken(['s', 'ss'], SECOND);

  // MOMENTS

  var getSetSecond = makeGetSet('Seconds', false);

  // FORMATTING

  addFormatToken('S', 0, 0, function () {
      return ~~(this.millisecond() / 100);
  });

  addFormatToken(0, ['SS', 2], 0, function () {
      return ~~(this.millisecond() / 10);
  });

  addFormatToken(0, ['SSS', 3], 0, 'millisecond');
  addFormatToken(0, ['SSSS', 4], 0, function () {
      return this.millisecond() * 10;
  });
  addFormatToken(0, ['SSSSS', 5], 0, function () {
      return this.millisecond() * 100;
  });
  addFormatToken(0, ['SSSSSS', 6], 0, function () {
      return this.millisecond() * 1000;
  });
  addFormatToken(0, ['SSSSSSS', 7], 0, function () {
      return this.millisecond() * 10000;
  });
  addFormatToken(0, ['SSSSSSSS', 8], 0, function () {
      return this.millisecond() * 100000;
  });
  addFormatToken(0, ['SSSSSSSSS', 9], 0, function () {
      return this.millisecond() * 1000000;
  });

  // ALIASES

  addUnitAlias('millisecond', 'ms');

  // PRIORITY

  addUnitPriority('millisecond', 16);

  // PARSING

  addRegexToken('S', match1to3, match1);
  addRegexToken('SS', match1to3, match2);
  addRegexToken('SSS', match1to3, match3);

  var token, getSetMillisecond;
  for (token = 'SSSS'; token.length <= 9; token += 'S') {
      addRegexToken(token, matchUnsigned);
  }

  function parseMs(input, array) {
      array[MILLISECOND] = toInt(('0.' + input) * 1000);
  }

  for (token = 'S'; token.length <= 9; token += 'S') {
      addParseToken(token, parseMs);
  }

  getSetMillisecond = makeGetSet('Milliseconds', false);

  // FORMATTING

  addFormatToken('z', 0, 0, 'zoneAbbr');
  addFormatToken('zz', 0, 0, 'zoneName');

  // MOMENTS

  function getZoneAbbr() {
      return this._isUTC ? 'UTC' : '';
  }

  function getZoneName() {
      return this._isUTC ? 'Coordinated Universal Time' : '';
  }

  var proto = Moment.prototype;

  proto.add = add;
  proto.calendar = calendar$1;
  proto.clone = clone;
  proto.diff = diff;
  proto.endOf = endOf;
  proto.format = format;
  proto.from = from;
  proto.fromNow = fromNow;
  proto.to = to;
  proto.toNow = toNow;
  proto.get = stringGet;
  proto.invalidAt = invalidAt;
  proto.isAfter = isAfter;
  proto.isBefore = isBefore;
  proto.isBetween = isBetween;
  proto.isSame = isSame;
  proto.isSameOrAfter = isSameOrAfter;
  proto.isSameOrBefore = isSameOrBefore;
  proto.isValid = isValid$2;
  proto.lang = lang;
  proto.locale = locale;
  proto.localeData = localeData;
  proto.max = prototypeMax;
  proto.min = prototypeMin;
  proto.parsingFlags = parsingFlags;
  proto.set = stringSet;
  proto.startOf = startOf;
  proto.subtract = subtract;
  proto.toArray = toArray;
  proto.toObject = toObject;
  proto.toDate = toDate;
  proto.toISOString = toISOString;
  proto.inspect = inspect;
  if (typeof Symbol !== 'undefined' && Symbol.for != null) {
      proto[Symbol.for('nodejs.util.inspect.custom')] = function () {
          return 'Moment<' + this.format() + '>';
      };
  }
  proto.toJSON = toJSON;
  proto.toString = toString;
  proto.unix = unix;
  proto.valueOf = valueOf;
  proto.creationData = creationData;
  proto.eraName = getEraName;
  proto.eraNarrow = getEraNarrow;
  proto.eraAbbr = getEraAbbr;
  proto.eraYear = getEraYear;
  proto.year = getSetYear;
  proto.isLeapYear = getIsLeapYear;
  proto.weekYear = getSetWeekYear;
  proto.isoWeekYear = getSetISOWeekYear;
  proto.quarter = proto.quarters = getSetQuarter;
  proto.month = getSetMonth;
  proto.daysInMonth = getDaysInMonth;
  proto.week = proto.weeks = getSetWeek;
  proto.isoWeek = proto.isoWeeks = getSetISOWeek;
  proto.weeksInYear = getWeeksInYear;
  proto.weeksInWeekYear = getWeeksInWeekYear;
  proto.isoWeeksInYear = getISOWeeksInYear;
  proto.isoWeeksInISOWeekYear = getISOWeeksInISOWeekYear;
  proto.date = getSetDayOfMonth;
  proto.day = proto.days = getSetDayOfWeek;
  proto.weekday = getSetLocaleDayOfWeek;
  proto.isoWeekday = getSetISODayOfWeek;
  proto.dayOfYear = getSetDayOfYear;
  proto.hour = proto.hours = getSetHour;
  proto.minute = proto.minutes = getSetMinute;
  proto.second = proto.seconds = getSetSecond;
  proto.millisecond = proto.milliseconds = getSetMillisecond;
  proto.utcOffset = getSetOffset;
  proto.utc = setOffsetToUTC;
  proto.local = setOffsetToLocal;
  proto.parseZone = setOffsetToParsedOffset;
  proto.hasAlignedHourOffset = hasAlignedHourOffset;
  proto.isDST = isDaylightSavingTime;
  proto.isLocal = isLocal;
  proto.isUtcOffset = isUtcOffset;
  proto.isUtc = isUtc;
  proto.isUTC = isUtc;
  proto.zoneAbbr = getZoneAbbr;
  proto.zoneName = getZoneName;
  proto.dates = deprecate(
      'dates accessor is deprecated. Use date instead.',
      getSetDayOfMonth
  );
  proto.months = deprecate(
      'months accessor is deprecated. Use month instead',
      getSetMonth
  );
  proto.years = deprecate(
      'years accessor is deprecated. Use year instead',
      getSetYear
  );
  proto.zone = deprecate(
      'moment().zone is deprecated, use moment().utcOffset instead. http://momentjs.com/guides/#/warnings/zone/',
      getSetZone
  );
  proto.isDSTShifted = deprecate(
      'isDSTShifted is deprecated. See http://momentjs.com/guides/#/warnings/dst-shifted/ for more information',
      isDaylightSavingTimeShifted
  );

  function createUnix(input) {
      return createLocal(input * 1000);
  }

  function createInZone() {
      return createLocal.apply(null, arguments).parseZone();
  }

  function preParsePostFormat(string) {
      return string;
  }

  var proto$1 = Locale.prototype;

  proto$1.calendar = calendar;
  proto$1.longDateFormat = longDateFormat;
  proto$1.invalidDate = invalidDate;
  proto$1.ordinal = ordinal;
  proto$1.preparse = preParsePostFormat;
  proto$1.postformat = preParsePostFormat;
  proto$1.relativeTime = relativeTime;
  proto$1.pastFuture = pastFuture;
  proto$1.set = set;
  proto$1.eras = localeEras;
  proto$1.erasParse = localeErasParse;
  proto$1.erasConvertYear = localeErasConvertYear;
  proto$1.erasAbbrRegex = erasAbbrRegex;
  proto$1.erasNameRegex = erasNameRegex;
  proto$1.erasNarrowRegex = erasNarrowRegex;

  proto$1.months = localeMonths;
  proto$1.monthsShort = localeMonthsShort;
  proto$1.monthsParse = localeMonthsParse;
  proto$1.monthsRegex = monthsRegex;
  proto$1.monthsShortRegex = monthsShortRegex;
  proto$1.week = localeWeek;
  proto$1.firstDayOfYear = localeFirstDayOfYear;
  proto$1.firstDayOfWeek = localeFirstDayOfWeek;

  proto$1.weekdays = localeWeekdays;
  proto$1.weekdaysMin = localeWeekdaysMin;
  proto$1.weekdaysShort = localeWeekdaysShort;
  proto$1.weekdaysParse = localeWeekdaysParse;

  proto$1.weekdaysRegex = weekdaysRegex;
  proto$1.weekdaysShortRegex = weekdaysShortRegex;
  proto$1.weekdaysMinRegex = weekdaysMinRegex;

  proto$1.isPM = localeIsPM;
  proto$1.meridiem = localeMeridiem;

  function get$1(format, index, field, setter) {
      var locale = getLocale(),
          utc = createUTC().set(setter, index);
      return locale[field](utc, format);
  }

  function listMonthsImpl(format, index, field) {
      if (isNumber(format)) {
          index = format;
          format = undefined;
      }

      format = format || '';

      if (index != null) {
          return get$1(format, index, field, 'month');
      }

      var i,
          out = [];
      for (i = 0; i < 12; i++) {
          out[i] = get$1(format, i, field, 'month');
      }
      return out;
  }

  // ()
  // (5)
  // (fmt, 5)
  // (fmt)
  // (true)
  // (true, 5)
  // (true, fmt, 5)
  // (true, fmt)
  function listWeekdaysImpl(localeSorted, format, index, field) {
      if (typeof localeSorted === 'boolean') {
          if (isNumber(format)) {
              index = format;
              format = undefined;
          }

          format = format || '';
      } else {
          format = localeSorted;
          index = format;
          localeSorted = false;

          if (isNumber(format)) {
              index = format;
              format = undefined;
          }

          format = format || '';
      }

      var locale = getLocale(),
          shift = localeSorted ? locale._week.dow : 0,
          i,
          out = [];

      if (index != null) {
          return get$1(format, (index + shift) % 7, field, 'day');
      }

      for (i = 0; i < 7; i++) {
          out[i] = get$1(format, (i + shift) % 7, field, 'day');
      }
      return out;
  }

  function listMonths(format, index) {
      return listMonthsImpl(format, index, 'months');
  }

  function listMonthsShort(format, index) {
      return listMonthsImpl(format, index, 'monthsShort');
  }

  function listWeekdays(localeSorted, format, index) {
      return listWeekdaysImpl(localeSorted, format, index, 'weekdays');
  }

  function listWeekdaysShort(localeSorted, format, index) {
      return listWeekdaysImpl(localeSorted, format, index, 'weekdaysShort');
  }

  function listWeekdaysMin(localeSorted, format, index) {
      return listWeekdaysImpl(localeSorted, format, index, 'weekdaysMin');
  }

  getSetGlobalLocale('en', {
      eras: [
          {
              since: '0001-01-01',
              until: +Infinity,
              offset: 1,
              name: 'Anno Domini',
              narrow: 'AD',
              abbr: 'AD',
          },
          {
              since: '0000-12-31',
              until: -Infinity,
              offset: 1,
              name: 'Before Christ',
              narrow: 'BC',
              abbr: 'BC',
          },
      ],
      dayOfMonthOrdinalParse: /\d{1,2}(th|st|nd|rd)/,
      ordinal: function (number) {
          var b = number % 10,
              output =
                  toInt((number % 100) / 10) === 1
                      ? 'th'
                      : b === 1
                      ? 'st'
                      : b === 2
                      ? 'nd'
                      : b === 3
                      ? 'rd'
                      : 'th';
          return number + output;
      },
  });

  // Side effect imports

  hooks.lang = deprecate(
      'moment.lang is deprecated. Use moment.locale instead.',
      getSetGlobalLocale
  );
  hooks.langData = deprecate(
      'moment.langData is deprecated. Use moment.localeData instead.',
      getLocale
  );

  var mathAbs = Math.abs;

  function abs() {
      var data = this._data;

      this._milliseconds = mathAbs(this._milliseconds);
      this._days = mathAbs(this._days);
      this._months = mathAbs(this._months);

      data.milliseconds = mathAbs(data.milliseconds);
      data.seconds = mathAbs(data.seconds);
      data.minutes = mathAbs(data.minutes);
      data.hours = mathAbs(data.hours);
      data.months = mathAbs(data.months);
      data.years = mathAbs(data.years);

      return this;
  }

  function addSubtract$1(duration, input, value, direction) {
      var other = createDuration(input, value);

      duration._milliseconds += direction * other._milliseconds;
      duration._days += direction * other._days;
      duration._months += direction * other._months;

      return duration._bubble();
  }

  // supports only 2.0-style add(1, 's') or add(duration)
  function add$1(input, value) {
      return addSubtract$1(this, input, value, 1);
  }

  // supports only 2.0-style subtract(1, 's') or subtract(duration)
  function subtract$1(input, value) {
      return addSubtract$1(this, input, value, -1);
  }

  function absCeil(number) {
      if (number < 0) {
          return Math.floor(number);
      } else {
          return Math.ceil(number);
      }
  }

  function bubble() {
      var milliseconds = this._milliseconds,
          days = this._days,
          months = this._months,
          data = this._data,
          seconds,
          minutes,
          hours,
          years,
          monthsFromDays;

      // if we have a mix of positive and negative values, bubble down first
      // check: https://github.com/moment/moment/issues/2166
      if (
          !(
              (milliseconds >= 0 && days >= 0 && months >= 0) ||
              (milliseconds <= 0 && days <= 0 && months <= 0)
          )
      ) {
          milliseconds += absCeil(monthsToDays(months) + days) * 864e5;
          days = 0;
          months = 0;
      }

      // The following code bubbles up values, see the tests for
      // examples of what that means.
      data.milliseconds = milliseconds % 1000;

      seconds = absFloor(milliseconds / 1000);
      data.seconds = seconds % 60;

      minutes = absFloor(seconds / 60);
      data.minutes = minutes % 60;

      hours = absFloor(minutes / 60);
      data.hours = hours % 24;

      days += absFloor(hours / 24);

      // convert days to months
      monthsFromDays = absFloor(daysToMonths(days));
      months += monthsFromDays;
      days -= absCeil(monthsToDays(monthsFromDays));

      // 12 months -> 1 year
      years = absFloor(months / 12);
      months %= 12;

      data.days = days;
      data.months = months;
      data.years = years;

      return this;
  }

  function daysToMonths(days) {
      // 400 years have 146097 days (taking into account leap year rules)
      // 400 years have 12 months === 4800
      return (days * 4800) / 146097;
  }

  function monthsToDays(months) {
      // the reverse of daysToMonths
      return (months * 146097) / 4800;
  }

  function as(units) {
      if (!this.isValid()) {
          return NaN;
      }
      var days,
          months,
          milliseconds = this._milliseconds;

      units = normalizeUnits(units);

      if (units === 'month' || units === 'quarter' || units === 'year') {
          days = this._days + milliseconds / 864e5;
          months = this._months + daysToMonths(days);
          switch (units) {
              case 'month':
                  return months;
              case 'quarter':
                  return months / 3;
              case 'year':
                  return months / 12;
          }
      } else {
          // handle milliseconds separately because of floating point math errors (issue #1867)
          days = this._days + Math.round(monthsToDays(this._months));
          switch (units) {
              case 'week':
                  return days / 7 + milliseconds / 6048e5;
              case 'day':
                  return days + milliseconds / 864e5;
              case 'hour':
                  return days * 24 + milliseconds / 36e5;
              case 'minute':
                  return days * 1440 + milliseconds / 6e4;
              case 'second':
                  return days * 86400 + milliseconds / 1000;
              // Math.floor prevents floating point math errors here
              case 'millisecond':
                  return Math.floor(days * 864e5) + milliseconds;
              default:
                  throw new Error('Unknown unit ' + units);
          }
      }
  }

  // TODO: Use this.as('ms')?
  function valueOf$1() {
      if (!this.isValid()) {
          return NaN;
      }
      return (
          this._milliseconds +
          this._days * 864e5 +
          (this._months % 12) * 2592e6 +
          toInt(this._months / 12) * 31536e6
      );
  }

  function makeAs(alias) {
      return function () {
          return this.as(alias);
      };
  }

  var asMilliseconds = makeAs('ms'),
      asSeconds = makeAs('s'),
      asMinutes = makeAs('m'),
      asHours = makeAs('h'),
      asDays = makeAs('d'),
      asWeeks = makeAs('w'),
      asMonths = makeAs('M'),
      asQuarters = makeAs('Q'),
      asYears = makeAs('y');

  function clone$1() {
      return createDuration(this);
  }

  function get$2(units) {
      units = normalizeUnits(units);
      return this.isValid() ? this[units + 's']() : NaN;
  }

  function makeGetter(name) {
      return function () {
          return this.isValid() ? this._data[name] : NaN;
      };
  }

  var milliseconds = makeGetter('milliseconds'),
      seconds = makeGetter('seconds'),
      minutes = makeGetter('minutes'),
      hours = makeGetter('hours'),
      days = makeGetter('days'),
      months = makeGetter('months'),
      years = makeGetter('years');

  function weeks() {
      return absFloor(this.days() / 7);
  }

  var round = Math.round,
      thresholds = {
          ss: 44, // a few seconds to seconds
          s: 45, // seconds to minute
          m: 45, // minutes to hour
          h: 22, // hours to day
          d: 26, // days to month/week
          w: null, // weeks to month
          M: 11, // months to year
      };

  // helper function for moment.fn.from, moment.fn.fromNow, and moment.duration.fn.humanize
  function substituteTimeAgo(string, number, withoutSuffix, isFuture, locale) {
      return locale.relativeTime(number || 1, !!withoutSuffix, string, isFuture);
  }

  function relativeTime$1(posNegDuration, withoutSuffix, thresholds, locale) {
      var duration = createDuration(posNegDuration).abs(),
          seconds = round(duration.as('s')),
          minutes = round(duration.as('m')),
          hours = round(duration.as('h')),
          days = round(duration.as('d')),
          months = round(duration.as('M')),
          weeks = round(duration.as('w')),
          years = round(duration.as('y')),
          a =
              (seconds <= thresholds.ss && ['s', seconds]) ||
              (seconds < thresholds.s && ['ss', seconds]) ||
              (minutes <= 1 && ['m']) ||
              (minutes < thresholds.m && ['mm', minutes]) ||
              (hours <= 1 && ['h']) ||
              (hours < thresholds.h && ['hh', hours]) ||
              (days <= 1 && ['d']) ||
              (days < thresholds.d && ['dd', days]);

      if (thresholds.w != null) {
          a =
              a ||
              (weeks <= 1 && ['w']) ||
              (weeks < thresholds.w && ['ww', weeks]);
      }
      a = a ||
          (months <= 1 && ['M']) ||
          (months < thresholds.M && ['MM', months]) ||
          (years <= 1 && ['y']) || ['yy', years];

      a[2] = withoutSuffix;
      a[3] = +posNegDuration > 0;
      a[4] = locale;
      return substituteTimeAgo.apply(null, a);
  }

  // This function allows you to set the rounding function for relative time strings
  function getSetRelativeTimeRounding(roundingFunction) {
      if (roundingFunction === undefined) {
          return round;
      }
      if (typeof roundingFunction === 'function') {
          round = roundingFunction;
          return true;
      }
      return false;
  }

  // This function allows you to set a threshold for relative time strings
  function getSetRelativeTimeThreshold(threshold, limit) {
      if (thresholds[threshold] === undefined) {
          return false;
      }
      if (limit === undefined) {
          return thresholds[threshold];
      }
      thresholds[threshold] = limit;
      if (threshold === 's') {
          thresholds.ss = limit - 1;
      }
      return true;
  }

  function humanize(argWithSuffix, argThresholds) {
      if (!this.isValid()) {
          return this.localeData().invalidDate();
      }

      var withSuffix = false,
          th = thresholds,
          locale,
          output;

      if (typeof argWithSuffix === 'object') {
          argThresholds = argWithSuffix;
          argWithSuffix = false;
      }
      if (typeof argWithSuffix === 'boolean') {
          withSuffix = argWithSuffix;
      }
      if (typeof argThresholds === 'object') {
          th = Object.assign({}, thresholds, argThresholds);
          if (argThresholds.s != null && argThresholds.ss == null) {
              th.ss = argThresholds.s - 1;
          }
      }

      locale = this.localeData();
      output = relativeTime$1(this, !withSuffix, th, locale);

      if (withSuffix) {
          output = locale.pastFuture(+this, output);
      }

      return locale.postformat(output);
  }

  var abs$1 = Math.abs;

  function sign(x) {
      return (x > 0) - (x < 0) || +x;
  }

  function toISOString$1() {
      // for ISO strings we do not use the normal bubbling rules:
      //  * milliseconds bubble up until they become hours
      //  * days do not bubble at all
      //  * months bubble up until they become years
      // This is because there is no context-free conversion between hours and days
      // (think of clock changes)
      // and also not between days and months (28-31 days per month)
      if (!this.isValid()) {
          return this.localeData().invalidDate();
      }

      var seconds = abs$1(this._milliseconds) / 1000,
          days = abs$1(this._days),
          months = abs$1(this._months),
          minutes,
          hours,
          years,
          s,
          total = this.asSeconds(),
          totalSign,
          ymSign,
          daysSign,
          hmsSign;

      if (!total) {
          // this is the same as C#'s (Noda) and python (isodate)...
          // but not other JS (goog.date)
          return 'P0D';
      }

      // 3600 seconds -> 60 minutes -> 1 hour
      minutes = absFloor(seconds / 60);
      hours = absFloor(minutes / 60);
      seconds %= 60;
      minutes %= 60;

      // 12 months -> 1 year
      years = absFloor(months / 12);
      months %= 12;

      // inspired by https://github.com/dordille/moment-isoduration/blob/master/moment.isoduration.js
      s = seconds ? seconds.toFixed(3).replace(/\.?0+$/, '') : '';

      totalSign = total < 0 ? '-' : '';
      ymSign = sign(this._months) !== sign(total) ? '-' : '';
      daysSign = sign(this._days) !== sign(total) ? '-' : '';
      hmsSign = sign(this._milliseconds) !== sign(total) ? '-' : '';

      return (
          totalSign +
          'P' +
          (years ? ymSign + years + 'Y' : '') +
          (months ? ymSign + months + 'M' : '') +
          (days ? daysSign + days + 'D' : '') +
          (hours || minutes || seconds ? 'T' : '') +
          (hours ? hmsSign + hours + 'H' : '') +
          (minutes ? hmsSign + minutes + 'M' : '') +
          (seconds ? hmsSign + s + 'S' : '')
      );
  }

  var proto$2 = Duration.prototype;

  proto$2.isValid = isValid$1;
  proto$2.abs = abs;
  proto$2.add = add$1;
  proto$2.subtract = subtract$1;
  proto$2.as = as;
  proto$2.asMilliseconds = asMilliseconds;
  proto$2.asSeconds = asSeconds;
  proto$2.asMinutes = asMinutes;
  proto$2.asHours = asHours;
  proto$2.asDays = asDays;
  proto$2.asWeeks = asWeeks;
  proto$2.asMonths = asMonths;
  proto$2.asQuarters = asQuarters;
  proto$2.asYears = asYears;
  proto$2.valueOf = valueOf$1;
  proto$2._bubble = bubble;
  proto$2.clone = clone$1;
  proto$2.get = get$2;
  proto$2.milliseconds = milliseconds;
  proto$2.seconds = seconds;
  proto$2.minutes = minutes;
  proto$2.hours = hours;
  proto$2.days = days;
  proto$2.weeks = weeks;
  proto$2.months = months;
  proto$2.years = years;
  proto$2.humanize = humanize;
  proto$2.toISOString = toISOString$1;
  proto$2.toString = toISOString$1;
  proto$2.toJSON = toISOString$1;
  proto$2.locale = locale;
  proto$2.localeData = localeData;

  proto$2.toIsoString = deprecate(
      'toIsoString() is deprecated. Please use toISOString() instead (notice the capitals)',
      toISOString$1
  );
  proto$2.lang = lang;

  // FORMATTING

  addFormatToken('X', 0, 0, 'unix');
  addFormatToken('x', 0, 0, 'valueOf');

  // PARSING

  addRegexToken('x', matchSigned);
  addRegexToken('X', matchTimestamp);
  addParseToken('X', function (input, array, config) {
      config._d = new Date(parseFloat(input) * 1000);
  });
  addParseToken('x', function (input, array, config) {
      config._d = new Date(toInt(input));
  });

  //! moment.js

  hooks.version = '2.29.4';

  setHookCallback(createLocal);

  hooks.fn = proto;
  hooks.min = min;
  hooks.max = max;
  hooks.now = now;
  hooks.utc = createUTC;
  hooks.unix = createUnix;
  hooks.months = listMonths;
  hooks.isDate = isDate;
  hooks.locale = getSetGlobalLocale;
  hooks.invalid = createInvalid;
  hooks.duration = createDuration;
  hooks.isMoment = isMoment;
  hooks.weekdays = listWeekdays;
  hooks.parseZone = createInZone;
  hooks.localeData = getLocale;
  hooks.isDuration = isDuration;
  hooks.monthsShort = listMonthsShort;
  hooks.weekdaysMin = listWeekdaysMin;
  hooks.defineLocale = defineLocale;
  hooks.updateLocale = updateLocale;
  hooks.locales = listLocales;
  hooks.weekdaysShort = listWeekdaysShort;
  hooks.normalizeUnits = normalizeUnits;
  hooks.relativeTimeRounding = getSetRelativeTimeRounding;
  hooks.relativeTimeThreshold = getSetRelativeTimeThreshold;
  hooks.calendarFormat = getCalendarFormat;
  hooks.prototype = proto;

  // currently HTML5 input type only supports 24-hour formats
  hooks.HTML5_FMT = {
      DATETIME_LOCAL: 'YYYY-MM-DDTHH:mm', // <input type="datetime-local" />
      DATETIME_LOCAL_SECONDS: 'YYYY-MM-DDTHH:mm:ss', // <input type="datetime-local" step="1" />
      DATETIME_LOCAL_MS: 'YYYY-MM-DDTHH:mm:ss.SSS', // <input type="datetime-local" step="0.001" />
      DATE: 'YYYY-MM-DD', // <input type="date" />
      TIME: 'HH:mm', // <input type="time" />
      TIME_SECONDS: 'HH:mm:ss', // <input type="time" step="1" />
      TIME_MS: 'HH:mm:ss.SSS', // <input type="time" step="0.001" />
      WEEK: 'GGGG-[W]WW', // <input type="week" />
      MONTH: 'YYYY-MM', // <input type="month" />
  };

  return hooks;

})));
